removeBridge pass tests
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_ff_bubbles.txt b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_ff_bubbles.txt
new file mode 100644
index 0000000..2896107
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_ff_bubbles.txt
@@ -0,0 +1,16 @@
+((2,1) [(3,1),(4,1),(2,2)] [] [] [(1,1)] CGTCC) (null)
+((2,2) [(2,3)] [] [] [(2,1)] GTCCT) (null)
+((2,3) [(2,4)] [] [] [(2,2)] TCCTT) (null)
+((2,4) [(4,4),(3,4)] [] [] [(1,4),(2,3)] CCTTA) (null)
+((4,1) [(4,2)] [] [] [(1,2),(2,1)] GTCCT) (null)
+((4,2) [(4,3)] [] [] [(4,1)] TCCTT) (null)
+((4,3) [(4,4)] [] [] [(1,4),(4,2)] CCTTA) (null)
+((4,4) [] [] [] [(2,4),(4,3)] CTTAG) (null)
+((1,1) [(2,1),(1,2)] [] [] [] ACGTC) (null)
+((1,2) [(3,1),(4,1),(1,3)] [] [] [(1,1)] CGTCC) (null)
+((1,3) [(1,4)] [] [] [(1,2)] GTCCT) (null)
+((1,4) [(3,3),(4,3),(2,4)] [] [] [(1,3)] TCCTT) (null)
+((3,1) [(3,2)] [] [] [(1,2),(2,1)] GTCCT) (null)
+((3,2) [(3,3)] [] [] [(3,1)] TCCTT) (null)
+((3,3) [(3,4)] [] [] [(1,4),(3,2)] CCTTA) (null)
+((3,4) [] [] [] [(2,4),(3,3)] CTTAG) (null)
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_ff_bubbles.txt.svg b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_ff_bubbles.txt.svg
new file mode 100644
index 0000000..fef64c2
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_ff_bubbles.txt.svg
@@ -0,0 +1,449 @@
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+</g>
+<!-- legend_0_3->legend_1_3 -->
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+</g>
+<!-- 1,1->1,2 -->
+<g id="edge61" class="edge"><title>1,1->1,2</title>
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+<!-- 1,1->2,1 -->
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+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="156.853,-331.379 167.097,-334.08 160.773,-325.58 156.853,-331.379"/>
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+<!-- 1,2->1,1 -->
+<g id="edge69" class="edge"><title>1,2->1,1</title>
+<path fill="none" stroke="#218559" d="M158.425,-267.244C143.825,-267.792 127.305,-267.895 111.982,-267.553"/>
+<polygon fill="#218559" stroke="#218559" points="111.704,-264.043 101.605,-267.245 111.497,-271.04 111.704,-264.043"/>
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+<!-- 1,3 -->
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+<text text-anchor="start" x="308" y="-243.667" font-family="Times Roman,serif" font-size="10.00">AGGAC</text>
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+<!-- 1,2->1,3 -->
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+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="272.364,-257.822 282.443,-254.554 272.527,-250.823 272.364,-257.822"/>
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+<!-- 1,2->3,1 -->
+<g id="edge63" class="edge"><title>1,2->3,1</title>
+<path fill="none" stroke="#dd1e2f" d="M227.005,-290.029C236.061,-300.138 244,-309 244,-309 244,-309 274,-405 274,-405 274,-405 282.027,-413.657 291.712,-424.101"/>
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+<!-- 3,1->1,2 -->
+<g id="edge85" class="edge"><title>3,1->1,2</title>
+<path fill="none" stroke="#218559" d="M298.604,-431.533C286.159,-418.113 274,-405 274,-405 274,-405 262,-384 262,-384 262,-384 244,-309 244,-309 244,-309 239.718,-304.221 233.857,-297.678"/>
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+<text text-anchor="start" x="431.5" y="-442.667" font-family="Times Roman,serif" font-size="10.00">AAGGA</text>
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+<!-- 3,2->3,1 -->
+<g id="edge91" class="edge"><title>3,2->3,1</title>
+<path fill="none" stroke="#218559" d="M406.443,-466.446C397.158,-466.745 387.225,-466.824 377.602,-466.681"/>
+<polygon fill="#218559" stroke="#218559" points="377.407,-463.175 367.327,-466.438 377.242,-470.173 377.407,-463.175"/>
+</g>
+<!-- 3,2->3,3 -->
+<g id="edge89" class="edge"><title>3,2->3,3</title>
+<path fill="none" stroke="#dd1e2f" d="M491.327,-453.562C500.601,-453.258 510.531,-453.176 520.159,-453.316"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="520.364,-456.822 530.443,-453.554 520.527,-449.823 520.364,-456.822"/>
+</g>
+<!-- 3,3->1,4 -->
+<g id="edge95" class="edge"><title>3,3->1,4</title>
+<path fill="none" stroke="#218559" d="M549.236,-429.604C539.291,-416.884 530,-405 530,-405 530,-405 510,-359 510,-359 510,-359 500,-309 500,-309 500,-309 493.498,-302.881 485.137,-295.012"/>
+<polygon fill="#218559" stroke="#218559" points="487.46,-292.391 477.779,-288.086 482.662,-297.489 487.46,-292.391"/>
+</g>
+<!-- 3,3->3,2 -->
+<g id="edge97" class="edge"><title>3,3->3,2</title>
+<path fill="none" stroke="#218559" d="M530.443,-466.446C521.158,-466.745 511.225,-466.824 501.602,-466.681"/>
+<polygon fill="#218559" stroke="#218559" points="501.407,-463.175 491.327,-466.438 501.242,-470.173 501.407,-463.175"/>
+</g>
+<!-- 3,4 -->
+<g id="node23" class="node"><title>3,4</title>
+<ellipse fill="none" stroke="black" cx="697" cy="-460" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="677.5" y="-471.167" font-family="Times Roman,serif" font-size="10.00">3,4--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="675,-452 675,-466 720,-466 720,-452 675,-452"/>
+<text text-anchor="start" x="682" y="-456.667" font-family="Times Roman,serif" font-size="10.00">CTTAG</text>
+<polygon fill="#218559" stroke="#218559" points="675,-438 675,-452 720,-452 720,-438 675,-438"/>
+<text text-anchor="start" x="681" y="-442.667" font-family="Times Roman,serif" font-size="10.00">CTAAG</text>
+</g>
+<!-- 3,3->3,4 -->
+<g id="edge93" class="edge"><title>3,3->3,4</title>
+<path fill="none" stroke="#dd1e2f" d="M615.327,-453.562C624.601,-453.258 634.531,-453.176 644.159,-453.316"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="644.364,-456.822 654.443,-453.554 644.527,-449.823 644.364,-456.822"/>
+</g>
+<!-- 3,4->3,3 -->
+<g id="edge101" class="edge"><title>3,4->3,3</title>
+<path fill="none" stroke="#218559" d="M654.443,-466.446C645.158,-466.745 635.225,-466.824 625.602,-466.681"/>
+<polygon fill="#218559" stroke="#218559" points="625.407,-463.175 615.327,-466.438 625.242,-470.173 625.407,-463.175"/>
+</g>
+<!-- 3,4->2,4 -->
+<g id="edge99" class="edge"><title>3,4->2,4</title>
+<path fill="none" stroke="#218559" d="M667.572,-433.467C651.973,-419.402 636,-405 636,-405 636,-405 625.367,-396.899 612.837,-387.352"/>
+<polygon fill="#218559" stroke="#218559" points="614.945,-384.558 604.869,-381.281 610.702,-390.126 614.945,-384.558"/>
+</g>
+<!-- 2,1->1,1 -->
+<g id="edge21" class="edge"><title>2,1->1,1</title>
+<path fill="none" stroke="#218559" d="M163.346,-338.87C142.193,-328.685 120,-318 120,-318 120,-318 108.279,-307.047 95.112,-294.744"/>
+<polygon fill="#218559" stroke="#218559" points="97.41,-292.101 87.7138,-287.831 92.6308,-297.216 97.41,-292.101"/>
+</g>
+<!-- 2,1->3,1 -->
+<g id="edge15" class="edge"><title>2,1->3,1</title>
+<path fill="none" stroke="#dd1e2f" d="M225.811,-386.692C242.699,-406.902 262,-430 262,-430 262,-430 268.943,-433.306 278.219,-437.723"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="276.728,-440.89 287.262,-442.029 279.738,-434.57 276.728,-440.89"/>
+</g>
+<!-- 2,2 -->
+<g id="node26" class="node"><title>2,2</title>
+<ellipse fill="none" stroke="black" cx="325" cy="-357" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="305.5" y="-368.167" font-family="Times Roman,serif" font-size="10.00">2,2--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="303,-349 303,-363 348,-363 348,-349 303,-349"/>
+<text text-anchor="start" x="310" y="-353.667" font-family="Times Roman,serif" font-size="10.00">GTCCT</text>
+<polygon fill="#218559" stroke="#218559" points="303,-335 303,-349 348,-349 348,-335 303,-335"/>
+<text text-anchor="start" x="308" y="-339.667" font-family="Times Roman,serif" font-size="10.00">AGGAC</text>
+</g>
+<!-- 2,1->2,2 -->
+<g id="edge19" class="edge"><title>2,1->2,2</title>
+<path fill="none" stroke="#dd1e2f" d="M243.327,-350.562C252.601,-350.258 262.531,-350.176 272.159,-350.316"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="272.364,-353.822 282.443,-350.554 272.527,-346.823 272.364,-353.822"/>
+</g>
+<!-- 2,1->4,1 -->
+<g id="edge17" class="edge"><title>2,1->4,1</title>
+<path fill="none" stroke="#dd1e2f" d="M227.005,-327.971C236.061,-317.862 244,-309 244,-309 244,-309 274,-213 274,-213 274,-213 280.502,-206.881 288.863,-199.012"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="291.338,-201.489 296.221,-192.086 286.54,-196.391 291.338,-201.489"/>
+</g>
+<!-- 2,2->2,1 -->
+<g id="edge25" class="edge"><title>2,2->2,1</title>
+<path fill="none" stroke="#218559" d="M282.443,-363.446C273.158,-363.745 263.225,-363.824 253.602,-363.681"/>
+<polygon fill="#218559" stroke="#218559" points="253.407,-360.175 243.327,-363.438 253.242,-367.173 253.407,-360.175"/>
+</g>
+<!-- 2,3 -->
+<g id="node27" class="node"><title>2,3</title>
+<ellipse fill="none" stroke="black" cx="449" cy="-357" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="429.5" y="-368.167" font-family="Times Roman,serif" font-size="10.00">2,3--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="427,-349 427,-363 472,-363 472,-349 427,-349"/>
+<text text-anchor="start" x="435" y="-353.667" font-family="Times Roman,serif" font-size="10.00">TCCTT</text>
+<polygon fill="#218559" stroke="#218559" points="427,-335 427,-349 472,-349 472,-335 427,-335"/>
+<text text-anchor="start" x="431.5" y="-339.667" font-family="Times Roman,serif" font-size="10.00">AAGGA</text>
+</g>
+<!-- 2,2->2,3 -->
+<g id="edge23" class="edge"><title>2,2->2,3</title>
+<path fill="none" stroke="#dd1e2f" d="M367.327,-350.562C376.601,-350.258 386.531,-350.176 396.159,-350.316"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="396.364,-353.822 406.443,-350.554 396.527,-346.823 396.364,-353.822"/>
+</g>
+<!-- 2,3->2,2 -->
+<g id="edge29" class="edge"><title>2,3->2,2</title>
+<path fill="none" stroke="#218559" d="M406.443,-363.446C397.158,-363.745 387.225,-363.824 377.602,-363.681"/>
+<polygon fill="#218559" stroke="#218559" points="377.407,-360.175 367.327,-363.438 377.242,-367.173 377.407,-360.175"/>
+</g>
+<!-- 2,3->2,4 -->
+<g id="edge27" class="edge"><title>2,3->2,4</title>
+<path fill="none" stroke="#dd1e2f" d="M491.327,-350.562C500.601,-350.258 510.531,-350.176 520.159,-350.316"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="520.364,-353.822 530.443,-350.554 520.527,-346.823 520.364,-353.822"/>
+</g>
+<!-- 2,4->1,4 -->
+<g id="edge35" class="edge"><title>2,4->1,4</title>
+<path fill="none" stroke="#218559" d="M541.015,-332.238C525.051,-319.878 505.587,-304.81 488.68,-291.72"/>
+<polygon fill="#218559" stroke="#218559" points="490.661,-288.827 480.611,-285.473 486.376,-294.363 490.661,-288.827"/>
+</g>
+<!-- 2,4->3,4 -->
+<g id="edge33" class="edge"><title>2,4->3,4</title>
+<path fill="none" stroke="#dd1e2f" d="M603.652,-382.461C620.195,-396.202 640.78,-413.301 658.406,-427.942"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="656.342,-430.778 666.271,-434.475 660.815,-425.393 656.342,-430.778"/>
+</g>
+<!-- 2,4->2,3 -->
+<g id="edge37" class="edge"><title>2,4->2,3</title>
+<path fill="none" stroke="#218559" d="M530.443,-363.446C521.158,-363.745 511.225,-363.824 501.602,-363.681"/>
+<polygon fill="#218559" stroke="#218559" points="501.407,-360.175 491.327,-363.438 501.242,-367.173 501.407,-360.175"/>
+</g>
+<!-- 4,4 -->
+<g id="node33" class="node"><title>4,4</title>
+<ellipse fill="none" stroke="black" cx="697" cy="-165" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="677.5" y="-176.167" font-family="Times Roman,serif" font-size="10.00">4,4--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="675,-157 675,-171 720,-171 720,-157 675,-157"/>
+<text text-anchor="start" x="682" y="-161.667" font-family="Times Roman,serif" font-size="10.00">CTTAG</text>
+<polygon fill="#218559" stroke="#218559" points="675,-143 675,-157 720,-157 720,-143 675,-143"/>
+<text text-anchor="start" x="681" y="-147.667" font-family="Times Roman,serif" font-size="10.00">CTAAG</text>
+</g>
+<!-- 2,4->4,4 -->
+<g id="edge31" class="edge"><title>2,4->4,4</title>
+<path fill="none" stroke="#dd1e2f" d="M593.476,-325.295C614.656,-292.5 647.802,-241.178 670.862,-205.472"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="674.008,-207.051 676.494,-196.752 668.128,-203.254 674.008,-207.051"/>
+</g>
+<!-- 4,1->1,2 -->
+<g id="edge41" class="edge"><title>4,1->1,2</title>
+<path fill="none" stroke="#218559" d="M285.459,-179.436C272.801,-184.057 262,-188 262,-188 262,-188 244,-213 244,-213 244,-213 239.718,-217.779 233.857,-224.322"/>
+<polygon fill="#218559" stroke="#218559" points="231.071,-222.187 227.005,-231.971 236.285,-226.858 231.071,-222.187"/>
+</g>
+<!-- 4,1->2,1 -->
+<g id="edge43" class="edge"><title>4,1->2,1</title>
+<path fill="none" stroke="#218559" d="M296.221,-192.086C284.653,-202.974 274,-213 274,-213 274,-213 262,-243 262,-243 262,-243 244,-309 244,-309 244,-309 239.718,-313.779 233.857,-320.322"/>
+<polygon fill="#218559" stroke="#218559" points="231.071,-318.187 227.005,-327.971 236.285,-322.858 231.071,-318.187"/>
+</g>
+<!-- 4,2 -->
+<g id="node31" class="node"><title>4,2</title>
+<ellipse fill="none" stroke="black" cx="449" cy="-165" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="429.5" y="-176.167" font-family="Times Roman,serif" font-size="10.00">4,2--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="427,-157 427,-171 472,-171 472,-157 427,-157"/>
+<text text-anchor="start" x="435" y="-161.667" font-family="Times Roman,serif" font-size="10.00">TCCTT</text>
+<polygon fill="#218559" stroke="#218559" points="427,-143 427,-157 472,-157 472,-143 427,-143"/>
+<text text-anchor="start" x="431.5" y="-147.667" font-family="Times Roman,serif" font-size="10.00">AAGGA</text>
+</g>
+<!-- 4,1->4,2 -->
+<g id="edge39" class="edge"><title>4,1->4,2</title>
+<path fill="none" stroke="#dd1e2f" d="M367.327,-158.562C376.601,-158.258 386.531,-158.176 396.159,-158.316"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="396.364,-161.822 406.443,-158.554 396.527,-154.823 396.364,-161.822"/>
+</g>
+<!-- 4,2->4,1 -->
+<g id="edge47" class="edge"><title>4,2->4,1</title>
+<path fill="none" stroke="#218559" d="M406.443,-171.446C397.158,-171.745 387.225,-171.824 377.602,-171.681"/>
+<polygon fill="#218559" stroke="#218559" points="377.407,-168.175 367.327,-171.438 377.242,-175.173 377.407,-168.175"/>
+</g>
+<!-- 4,2->4,3 -->
+<g id="edge45" class="edge"><title>4,2->4,3</title>
+<path fill="none" stroke="#dd1e2f" d="M491.327,-158.562C500.601,-158.258 510.531,-158.176 520.159,-158.316"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="520.364,-161.822 530.443,-158.554 520.527,-154.823 520.364,-161.822"/>
+</g>
+<!-- 4,3->1,4 -->
+<g id="edge51" class="edge"><title>4,3->1,4</title>
+<path fill="none" stroke="#218559" d="M541.015,-189.762C525.051,-202.122 505.587,-217.19 488.68,-230.28"/>
+<polygon fill="#218559" stroke="#218559" points="486.376,-227.637 480.611,-236.527 490.661,-233.173 486.376,-227.637"/>
+</g>
+<!-- 4,3->4,2 -->
+<g id="edge53" class="edge"><title>4,3->4,2</title>
+<path fill="none" stroke="#218559" d="M530.443,-171.446C521.158,-171.745 511.225,-171.824 501.602,-171.681"/>
+<polygon fill="#218559" stroke="#218559" points="501.407,-168.175 491.327,-171.438 501.242,-175.173 501.407,-168.175"/>
+</g>
+<!-- 4,3->4,4 -->
+<g id="edge49" class="edge"><title>4,3->4,4</title>
+<path fill="none" stroke="#dd1e2f" d="M615.327,-158.562C624.601,-158.258 634.531,-158.176 644.159,-158.316"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="644.364,-161.822 654.443,-158.554 644.527,-154.823 644.364,-161.822"/>
+</g>
+<!-- 4,4->2,4 -->
+<g id="edge55" class="edge"><title>4,4->2,4</title>
+<path fill="none" stroke="#218559" d="M678.863,-197.706C660.882,-230.131 636,-275 636,-275 636,-275 618.994,-297.135 602.652,-318.405"/>
+<polygon fill="#218559" stroke="#218559" points="599.776,-316.404 596.459,-326.466 605.327,-320.669 599.776,-316.404"/>
+</g>
+<!-- 4,4->4,3 -->
+<g id="edge57" class="edge"><title>4,4->4,3</title>
+<path fill="none" stroke="#218559" d="M654.443,-171.446C645.158,-171.745 635.225,-171.824 625.602,-171.681"/>
+<polygon fill="#218559" stroke="#218559" points="625.407,-168.175 615.327,-171.438 625.242,-175.173 625.407,-168.175"/>
+</g>
+</g>
+</svg>
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_ff_bubbles/.part-0.crc b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_ff_bubbles/.part-0.crc
new file mode 100644
index 0000000..2085368
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_ff_bubbles/.part-0.crc
Binary files differ
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_ff_bubbles/.part-1.crc b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_ff_bubbles/.part-1.crc
new file mode 100644
index 0000000..69dcf7d
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_ff_bubbles/.part-1.crc
Binary files differ
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_ff_bubbles/part-0 b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_ff_bubbles/part-0
new file mode 100755
index 0000000..36702f5
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_ff_bubbles/part-0
Binary files differ
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_ff_bubbles/part-1 b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_ff_bubbles/part-1
new file mode 100755
index 0000000..9045432
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_ff_bubbles/part-1
Binary files differ
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_length1_bubbles.txt b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_length1_bubbles.txt
new file mode 100644
index 0000000..a41ce56
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_length1_bubbles.txt
@@ -0,0 +1,18 @@
+((2,1) [(2,3)] [] [] [] AATAGA) (null)
+((2,3) [(6,1),(2,4)] [] [] [(2,1)] TAGAA) (null)
+((2,4) [(6,2)] [] [] [(2,3)] AGAAG) (null)
+((4,1) [(4,3)] [] [] [] AATAGA) (null)
+((4,3) [(6,1),(4,4)] [] [] [(4,1)] TAGAA) (null)
+((4,4) [(6,2)] [] [] [(4,3)] AGAAG) (null)
+((6,1) [(6,2)] [] [] [(2,3),(1,3),(3,3),(4,3),(5,3)] AGAAG) (null)
+((6,2) [(6,3)] [] [] [(2,4),(3,4),(1,4),(4,4),(5,4),(6,1)] GAAGA) (null)
+((6,3) [] [] [] [(6,2)] AAGAAG) (null)
+((1,1) [(1,3)] [] [] [] AATAGA) (null)
+((1,3) [(6,1),(1,4)] [] [] [(1,1)] TAGAA) (null)
+((1,4) [(6,2)] [] [] [(1,3)] AGAAG) (null)
+((3,1) [(3,3)] [] [] [] AATAGA) (null)
+((3,3) [(6,1),(3,4)] [] [] [(3,1)] TAGAA) (null)
+((3,4) [(6,2)] [] [] [(3,3)] AGAAG) (null)
+((5,1) [(5,3)] [] [] [] AATAGA) (null)
+((5,3) [(6,1),(5,4)] [] [] [(5,1)] TAGAA) (null)
+((5,4) [(6,2)] [] [] [(5,3)] AGAAG) (null)
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_length1_bubbles.txt.svg b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_length1_bubbles.txt.svg
new file mode 100644
index 0000000..ff38f7d
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_length1_bubbles.txt.svg
@@ -0,0 +1,473 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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+ "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<!-- Generated by graphviz version 2.26.3 (20100126.1600)
+ -->
+<!-- Title: five_length1_bubbles_txt Pages: 1 -->
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+ viewBox="0.00 0.00 646.00 844.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+<g id="graph1" class="graph" transform="scale(1 1) rotate(0) translate(4 840)">
+<title>five_length1_bubbles_txt</title>
+<polygon fill="white" stroke="white" points="-4,5 -4,-840 643,-840 643,5 -4,5"/>
+<g id="graph2" class="cluster"><title>cluster_legend</title>
+<polygon fill="none" stroke="black" points="49,-8 49,-209 211,-209 211,-8 49,-8"/>
+<text text-anchor="middle" x="130" y="-192.4" font-family="Times Roman,serif" font-size="14.00">legend</text>
+</g>
+<g id="graph3" class="cluster"><title>cluster_1</title>
+<polygon fill="none" stroke="black" points="8,-548 8,-636 376,-636 376,-548 8,-548"/>
+</g>
+<g id="graph4" class="cluster"><title>cluster_3</title>
+<polygon fill="none" stroke="black" points="8,-320 8,-408 376,-408 376,-320 8,-320"/>
+</g>
+<g id="graph5" class="cluster"><title>cluster_2</title>
+<polygon fill="none" stroke="black" points="8,-740 8,-828 376,-828 376,-740 8,-740"/>
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+<g id="graph6" class="cluster"><title>cluster_5</title>
+<polygon fill="none" stroke="black" points="8,-644 8,-732 376,-732 376,-644 8,-644"/>
+</g>
+<g id="graph7" class="cluster"><title>cluster_4</title>
+<polygon fill="none" stroke="black" points="8,-217 8,-305 376,-305 376,-217 8,-217"/>
+</g>
+<g id="graph8" class="cluster"><title>cluster_6</title>
+<polygon fill="none" stroke="black" points="274,-426 274,-514 630,-514 630,-426 274,-426"/>
+</g>
+<!-- legend_0_0 -->
+<g id="node2" class="node"><title>legend_0_0</title>
+<ellipse fill="black" stroke="black" cx="59" cy="-157" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_1_0 -->
+<g id="node3" class="node"><title>legend_1_0</title>
+<ellipse fill="black" stroke="black" cx="201" cy="-157" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_0_0->legend_1_0 -->
+<g id="edge3" class="edge"><title>legend_0_0->legend_1_0</title>
+<path fill="none" stroke="#dd1e2f" d="M61.0074,-157C74.8673,-157 156.744,-157 188.46,-157"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="188.862,-160.5 198.862,-157 188.861,-153.5 188.862,-160.5"/>
+<text text-anchor="middle" x="130" y="-162.4" font-family="Times Roman,serif" font-size="14.00">FF</text>
+</g>
+<!-- legend_0_1 -->
+<g id="node5" class="node"><title>legend_0_1</title>
+<ellipse fill="black" stroke="black" cx="59" cy="-116" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_1_1 -->
+<g id="node6" class="node"><title>legend_1_1</title>
+<ellipse fill="black" stroke="black" cx="201" cy="-116" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_0_1->legend_1_1 -->
+<g id="edge5" class="edge"><title>legend_0_1->legend_1_1</title>
+<path fill="none" stroke="#ebb035" d="M61.0074,-116C74.8673,-116 156.744,-116 188.46,-116"/>
+<polygon fill="#ebb035" stroke="#ebb035" points="188.862,-119.5 198.862,-116 188.861,-112.5 188.862,-119.5"/>
+<text text-anchor="middle" x="130" y="-121.4" font-family="Times Roman,serif" font-size="14.00">FR</text>
+</g>
+<!-- legend_0_2 -->
+<g id="node8" class="node"><title>legend_0_2</title>
+<ellipse fill="black" stroke="black" cx="59" cy="-75" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_1_2 -->
+<g id="node9" class="node"><title>legend_1_2</title>
+<ellipse fill="black" stroke="black" cx="201" cy="-75" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_0_2->legend_1_2 -->
+<g id="edge7" class="edge"><title>legend_0_2->legend_1_2</title>
+<path fill="none" stroke="#06a2cb" d="M61.0074,-75C74.8673,-75 156.744,-75 188.46,-75"/>
+<polygon fill="#06a2cb" stroke="#06a2cb" points="188.862,-78.5001 198.862,-75 188.861,-71.5001 188.862,-78.5001"/>
+<text text-anchor="middle" x="130" y="-80.4" font-family="Times Roman,serif" font-size="14.00">RF</text>
+</g>
+<!-- legend_0_3 -->
+<g id="node11" class="node"><title>legend_0_3</title>
+<ellipse fill="black" stroke="black" cx="59" cy="-34" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_1_3 -->
+<g id="node12" class="node"><title>legend_1_3</title>
+<ellipse fill="black" stroke="black" cx="201" cy="-34" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_0_3->legend_1_3 -->
+<g id="edge9" class="edge"><title>legend_0_3->legend_1_3</title>
+<path fill="none" stroke="#218559" d="M61.0074,-34C74.8673,-34 156.744,-34 188.46,-34"/>
+<polygon fill="#218559" stroke="#218559" points="188.862,-37.5001 198.862,-34 188.861,-30.5001 188.862,-37.5001"/>
+<text text-anchor="middle" x="130" y="-39.4" font-family="Times Roman,serif" font-size="14.00">RR</text>
+</g>
+<!-- 1,1 -->
+<g id="node15" class="node"><title>1,1</title>
+<ellipse fill="none" stroke="black" cx="59" cy="-592" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="39.5" y="-603.167" font-family="Times Roman,serif" font-size="10.00">1,1--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="37,-584 37,-598 82,-598 82,-584 37,-584"/>
+<text text-anchor="start" x="40" y="-588.667" font-family="Times Roman,serif" font-size="10.00">AATAGA</text>
+<polygon fill="#218559" stroke="#218559" points="37,-570 37,-584 82,-584 82,-570 37,-570"/>
+<text text-anchor="start" x="43" y="-574.667" font-family="Times Roman,serif" font-size="10.00">TCTATT</text>
+</g>
+<!-- 1,3 -->
+<g id="node16" class="node"><title>1,3</title>
+<ellipse fill="none" stroke="black" cx="201" cy="-592" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="181.5" y="-603.167" font-family="Times Roman,serif" font-size="10.00">1,3--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="179,-584 179,-598 224,-598 224,-584 179,-584"/>
+<text text-anchor="start" x="185" y="-588.667" font-family="Times Roman,serif" font-size="10.00">TAGAA</text>
+<polygon fill="#218559" stroke="#218559" points="179,-570 179,-584 224,-584 224,-570 179,-570"/>
+<text text-anchor="start" x="187.5" y="-574.667" font-family="Times Roman,serif" font-size="10.00">TTCTA</text>
+</g>
+<!-- 1,1->1,3 -->
+<g id="edge69" class="edge"><title>1,1->1,3</title>
+<path fill="none" stroke="#dd1e2f" d="M101.605,-585.755C116.207,-585.208 132.729,-585.105 148.049,-585.448"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="148.326,-588.957 158.425,-585.756 148.534,-581.96 148.326,-588.957"/>
+</g>
+<!-- 1,3->1,1 -->
+<g id="edge75" class="edge"><title>1,3->1,1</title>
+<path fill="none" stroke="#218559" d="M158.425,-598.244C143.825,-598.792 127.305,-598.895 111.982,-598.553"/>
+<polygon fill="#218559" stroke="#218559" points="111.704,-595.043 101.605,-598.245 111.497,-602.04 111.704,-595.043"/>
+</g>
+<!-- 1,4 -->
+<g id="node17" class="node"><title>1,4</title>
+<ellipse fill="none" stroke="black" cx="325" cy="-592" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="305.5" y="-603.167" font-family="Times Roman,serif" font-size="10.00">1,4--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="303,-584 303,-598 348,-598 348,-584 303,-584"/>
+<text text-anchor="start" x="307.5" y="-588.667" font-family="Times Roman,serif" font-size="10.00">AGAAG</text>
+<polygon fill="#218559" stroke="#218559" points="303,-570 303,-584 348,-584 348,-570 303,-570"/>
+<text text-anchor="start" x="311" y="-574.667" font-family="Times Roman,serif" font-size="10.00">CTTCT</text>
+</g>
+<!-- 1,3->1,4 -->
+<g id="edge73" class="edge"><title>1,3->1,4</title>
+<path fill="none" stroke="#dd1e2f" d="M243.327,-585.562C252.601,-585.258 262.531,-585.176 272.159,-585.316"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="272.364,-588.822 282.443,-585.554 272.527,-581.823 272.364,-588.822"/>
+</g>
+<!-- 6,1 -->
+<g id="node35" class="node"><title>6,1</title>
+<ellipse fill="none" stroke="black" cx="325" cy="-470" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="305.5" y="-481.167" font-family="Times Roman,serif" font-size="10.00">6,1--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="303,-462 303,-476 348,-476 348,-462 303,-462"/>
+<text text-anchor="start" x="307.5" y="-466.667" font-family="Times Roman,serif" font-size="10.00">AGAAG</text>
+<polygon fill="#218559" stroke="#218559" points="303,-448 303,-462 348,-462 348,-448 303,-448"/>
+<text text-anchor="start" x="311" y="-452.667" font-family="Times Roman,serif" font-size="10.00">CTTCT</text>
+</g>
+<!-- 1,3->6,1 -->
+<g id="edge71" class="edge"><title>1,3->6,1</title>
+<path fill="none" stroke="#dd1e2f" d="M217.507,-558.714C235.573,-522.287 262,-469 262,-469 262,-469 264,-469 264,-469 264,-469 267.077,-469.05 271.85,-469.129"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="271.916,-472.63 281.972,-469.295 272.031,-465.631 271.916,-472.63"/>
+</g>
+<!-- 1,4->1,3 -->
+<g id="edge79" class="edge"><title>1,4->1,3</title>
+<path fill="none" stroke="#218559" d="M282.443,-598.446C273.158,-598.745 263.225,-598.824 253.602,-598.681"/>
+<polygon fill="#218559" stroke="#218559" points="253.407,-595.175 243.327,-598.438 253.242,-602.173 253.407,-595.175"/>
+</g>
+<!-- 6,2 -->
+<g id="node36" class="node"><title>6,2</title>
+<ellipse fill="none" stroke="black" cx="449" cy="-470" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="429.5" y="-481.167" font-family="Times Roman,serif" font-size="10.00">6,2--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="427,-462 427,-476 472,-476 472,-462 427,-462"/>
+<text text-anchor="start" x="431.5" y="-466.667" font-family="Times Roman,serif" font-size="10.00">GAAGA</text>
+<polygon fill="#218559" stroke="#218559" points="427,-448 427,-462 472,-462 472,-448 427,-448"/>
+<text text-anchor="start" x="435.5" y="-452.667" font-family="Times Roman,serif" font-size="10.00">TCTTC</text>
+</g>
+<!-- 1,4->6,2 -->
+<g id="edge77" class="edge"><title>1,4->6,2</title>
+<path fill="none" stroke="#dd1e2f" d="M353.138,-564.316C371.132,-546.612 394.616,-523.507 413.837,-504.596"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="416.3,-507.082 420.974,-497.574 411.391,-502.093 416.3,-507.082"/>
+</g>
+<!-- 3,1 -->
+<g id="node19" class="node"><title>3,1</title>
+<ellipse fill="none" stroke="black" cx="59" cy="-364" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="39.5" y="-375.167" font-family="Times Roman,serif" font-size="10.00">3,1--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="37,-356 37,-370 82,-370 82,-356 37,-356"/>
+<text text-anchor="start" x="40" y="-360.667" font-family="Times Roman,serif" font-size="10.00">AATAGA</text>
+<polygon fill="#218559" stroke="#218559" points="37,-342 37,-356 82,-356 82,-342 37,-342"/>
+<text text-anchor="start" x="43" y="-346.667" font-family="Times Roman,serif" font-size="10.00">TCTATT</text>
+</g>
+<!-- 3,3 -->
+<g id="node20" class="node"><title>3,3</title>
+<ellipse fill="none" stroke="black" cx="201" cy="-364" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="181.5" y="-375.167" font-family="Times Roman,serif" font-size="10.00">3,3--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="179,-356 179,-370 224,-370 224,-356 179,-356"/>
+<text text-anchor="start" x="185" y="-360.667" font-family="Times Roman,serif" font-size="10.00">TAGAA</text>
+<polygon fill="#218559" stroke="#218559" points="179,-342 179,-356 224,-356 224,-342 179,-342"/>
+<text text-anchor="start" x="187.5" y="-346.667" font-family="Times Roman,serif" font-size="10.00">TTCTA</text>
+</g>
+<!-- 3,1->3,3 -->
+<g id="edge81" class="edge"><title>3,1->3,3</title>
+<path fill="none" stroke="#dd1e2f" d="M101.605,-357.755C116.207,-357.208 132.729,-357.105 148.049,-357.448"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="148.326,-360.957 158.425,-357.756 148.534,-353.96 148.326,-360.957"/>
+</g>
+<!-- 3,3->3,1 -->
+<g id="edge87" class="edge"><title>3,3->3,1</title>
+<path fill="none" stroke="#218559" d="M158.425,-370.244C143.825,-370.792 127.305,-370.895 111.982,-370.553"/>
+<polygon fill="#218559" stroke="#218559" points="111.704,-367.043 101.605,-370.245 111.497,-374.04 111.704,-367.043"/>
+</g>
+<!-- 3,4 -->
+<g id="node21" class="node"><title>3,4</title>
+<ellipse fill="none" stroke="black" cx="325" cy="-364" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="305.5" y="-375.167" font-family="Times Roman,serif" font-size="10.00">3,4--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="303,-356 303,-370 348,-370 348,-356 303,-356"/>
+<text text-anchor="start" x="307.5" y="-360.667" font-family="Times Roman,serif" font-size="10.00">AGAAG</text>
+<polygon fill="#218559" stroke="#218559" points="303,-342 303,-356 348,-356 348,-342 303,-342"/>
+<text text-anchor="start" x="311" y="-346.667" font-family="Times Roman,serif" font-size="10.00">CTTCT</text>
+</g>
+<!-- 3,3->3,4 -->
+<g id="edge85" class="edge"><title>3,3->3,4</title>
+<path fill="none" stroke="#dd1e2f" d="M243.327,-357.562C252.601,-357.258 262.531,-357.176 272.159,-357.316"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="272.364,-360.822 282.443,-357.554 272.527,-353.823 272.364,-360.822"/>
+</g>
+<!-- 3,3->6,1 -->
+<g id="edge83" class="edge"><title>3,3->6,1</title>
+<path fill="none" stroke="#dd1e2f" d="M231.334,-389.931C247.997,-404.175 268.832,-421.985 286.618,-437.19"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="284.674,-440.132 294.55,-443.97 289.223,-434.812 284.674,-440.132"/>
+</g>
+<!-- 3,4->3,3 -->
+<g id="edge91" class="edge"><title>3,4->3,3</title>
+<path fill="none" stroke="#218559" d="M282.443,-370.446C273.158,-370.745 263.225,-370.824 253.602,-370.681"/>
+<polygon fill="#218559" stroke="#218559" points="253.407,-367.175 243.327,-370.438 253.242,-374.173 253.407,-367.175"/>
+</g>
+<!-- 3,4->6,2 -->
+<g id="edge89" class="edge"><title>3,4->6,2</title>
+<path fill="none" stroke="#dd1e2f" d="M356.869,-388.787C372.495,-400.941 388,-413 388,-413 388,-413 399.721,-423.953 412.888,-436.256"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="410.59,-438.899 420.286,-443.169 415.369,-433.784 410.59,-438.899"/>
+</g>
+<!-- 2,1 -->
+<g id="node23" class="node"><title>2,1</title>
+<ellipse fill="none" stroke="black" cx="59" cy="-784" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="39.5" y="-795.167" font-family="Times Roman,serif" font-size="10.00">2,1--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="37,-776 37,-790 82,-790 82,-776 37,-776"/>
+<text text-anchor="start" x="40" y="-780.667" font-family="Times Roman,serif" font-size="10.00">AATAGA</text>
+<polygon fill="#218559" stroke="#218559" points="37,-762 37,-776 82,-776 82,-762 37,-762"/>
+<text text-anchor="start" x="43" y="-766.667" font-family="Times Roman,serif" font-size="10.00">TCTATT</text>
+</g>
+<!-- 2,3 -->
+<g id="node24" class="node"><title>2,3</title>
+<ellipse fill="none" stroke="black" cx="201" cy="-784" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="181.5" y="-795.167" font-family="Times Roman,serif" font-size="10.00">2,3--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="179,-776 179,-790 224,-790 224,-776 179,-776"/>
+<text text-anchor="start" x="185" y="-780.667" font-family="Times Roman,serif" font-size="10.00">TAGAA</text>
+<polygon fill="#218559" stroke="#218559" points="179,-762 179,-776 224,-776 224,-762 179,-762"/>
+<text text-anchor="start" x="187.5" y="-766.667" font-family="Times Roman,serif" font-size="10.00">TTCTA</text>
+</g>
+<!-- 2,1->2,3 -->
+<g id="edge17" class="edge"><title>2,1->2,3</title>
+<path fill="none" stroke="#dd1e2f" d="M101.605,-777.755C116.207,-777.208 132.729,-777.105 148.049,-777.448"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="148.326,-780.957 158.425,-777.756 148.534,-773.96 148.326,-780.957"/>
+</g>
+<!-- 2,3->2,1 -->
+<g id="edge23" class="edge"><title>2,3->2,1</title>
+<path fill="none" stroke="#218559" d="M158.425,-790.244C143.825,-790.792 127.305,-790.895 111.982,-790.553"/>
+<polygon fill="#218559" stroke="#218559" points="111.704,-787.043 101.605,-790.245 111.497,-794.04 111.704,-787.043"/>
+</g>
+<!-- 2,4 -->
+<g id="node25" class="node"><title>2,4</title>
+<ellipse fill="none" stroke="black" cx="325" cy="-784" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="305.5" y="-795.167" font-family="Times Roman,serif" font-size="10.00">2,4--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="303,-776 303,-790 348,-790 348,-776 303,-776"/>
+<text text-anchor="start" x="307.5" y="-780.667" font-family="Times Roman,serif" font-size="10.00">AGAAG</text>
+<polygon fill="#218559" stroke="#218559" points="303,-762 303,-776 348,-776 348,-762 303,-762"/>
+<text text-anchor="start" x="311" y="-766.667" font-family="Times Roman,serif" font-size="10.00">CTTCT</text>
+</g>
+<!-- 2,3->2,4 -->
+<g id="edge21" class="edge"><title>2,3->2,4</title>
+<path fill="none" stroke="#dd1e2f" d="M243.327,-777.562C252.601,-777.258 262.531,-777.176 272.159,-777.316"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="272.364,-780.822 282.443,-777.554 272.527,-773.823 272.364,-780.822"/>
+</g>
+<!-- 2,3->6,1 -->
+<g id="edge19" class="edge"><title>2,3->6,1</title>
+<path fill="none" stroke="#dd1e2f" d="M227.005,-754.971C236.061,-744.862 244,-736 244,-736 244,-736 274,-544 274,-544 274,-544 285.426,-527.421 297.461,-509.958"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="300.579,-511.603 303.371,-501.383 294.815,-507.63 300.579,-511.603"/>
+</g>
+<!-- 2,4->2,3 -->
+<g id="edge27" class="edge"><title>2,4->2,3</title>
+<path fill="none" stroke="#218559" d="M282.443,-790.446C273.158,-790.745 263.225,-790.824 253.602,-790.681"/>
+<polygon fill="#218559" stroke="#218559" points="253.407,-787.175 243.327,-790.438 253.242,-794.173 253.407,-787.175"/>
+</g>
+<!-- 2,4->6,2 -->
+<g id="edge25" class="edge"><title>2,4->6,2</title>
+<path fill="none" stroke="#dd1e2f" d="M353.779,-756.914C365.347,-746.026 376,-736 376,-736 376,-736 415.795,-590.993 436.621,-515.107"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="440.035,-515.892 439.306,-505.323 433.284,-514.04 440.035,-515.892"/>
+</g>
+<!-- 5,1 -->
+<g id="node27" class="node"><title>5,1</title>
+<ellipse fill="none" stroke="black" cx="59" cy="-688" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="39.5" y="-699.167" font-family="Times Roman,serif" font-size="10.00">5,1--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="37,-680 37,-694 82,-694 82,-680 37,-680"/>
+<text text-anchor="start" x="40" y="-684.667" font-family="Times Roman,serif" font-size="10.00">AATAGA</text>
+<polygon fill="#218559" stroke="#218559" points="37,-666 37,-680 82,-680 82,-666 37,-666"/>
+<text text-anchor="start" x="43" y="-670.667" font-family="Times Roman,serif" font-size="10.00">TCTATT</text>
+</g>
+<!-- 5,3 -->
+<g id="node28" class="node"><title>5,3</title>
+<ellipse fill="none" stroke="black" cx="201" cy="-688" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="181.5" y="-699.167" font-family="Times Roman,serif" font-size="10.00">5,3--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="179,-680 179,-694 224,-694 224,-680 179,-680"/>
+<text text-anchor="start" x="185" y="-684.667" font-family="Times Roman,serif" font-size="10.00">TAGAA</text>
+<polygon fill="#218559" stroke="#218559" points="179,-666 179,-680 224,-680 224,-666 179,-666"/>
+<text text-anchor="start" x="187.5" y="-670.667" font-family="Times Roman,serif" font-size="10.00">TTCTA</text>
+</g>
+<!-- 5,1->5,3 -->
+<g id="edge93" class="edge"><title>5,1->5,3</title>
+<path fill="none" stroke="#dd1e2f" d="M101.605,-681.755C116.207,-681.208 132.729,-681.105 148.049,-681.448"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="148.326,-684.957 158.425,-681.756 148.534,-677.96 148.326,-684.957"/>
+</g>
+<!-- 5,3->5,1 -->
+<g id="edge99" class="edge"><title>5,3->5,1</title>
+<path fill="none" stroke="#218559" d="M158.425,-694.244C143.825,-694.792 127.305,-694.895 111.982,-694.553"/>
+<polygon fill="#218559" stroke="#218559" points="111.704,-691.043 101.605,-694.245 111.497,-698.04 111.704,-691.043"/>
+</g>
+<!-- 5,4 -->
+<g id="node29" class="node"><title>5,4</title>
+<ellipse fill="none" stroke="black" cx="325" cy="-688" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="305.5" y="-699.167" font-family="Times Roman,serif" font-size="10.00">5,4--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="303,-680 303,-694 348,-694 348,-680 303,-680"/>
+<text text-anchor="start" x="307.5" y="-684.667" font-family="Times Roman,serif" font-size="10.00">AGAAG</text>
+<polygon fill="#218559" stroke="#218559" points="303,-666 303,-680 348,-680 348,-666 303,-666"/>
+<text text-anchor="start" x="311" y="-670.667" font-family="Times Roman,serif" font-size="10.00">CTTCT</text>
+</g>
+<!-- 5,3->5,4 -->
+<g id="edge97" class="edge"><title>5,3->5,4</title>
+<path fill="none" stroke="#dd1e2f" d="M243.327,-681.562C252.601,-681.258 262.531,-681.176 272.159,-681.316"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="272.364,-684.822 282.443,-681.554 272.527,-677.823 272.364,-684.822"/>
+</g>
+<!-- 5,3->6,1 -->
+<g id="edge95" class="edge"><title>5,3->6,1</title>
+<path fill="none" stroke="#dd1e2f" d="M227.005,-658.971C236.061,-648.862 244,-640 244,-640 244,-640 262,-514 262,-514 262,-514 271.601,-507.295 283.307,-499.119"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="285.461,-501.884 291.655,-493.288 281.453,-496.145 285.461,-501.884"/>
+</g>
+<!-- 5,4->5,3 -->
+<g id="edge103" class="edge"><title>5,4->5,3</title>
+<path fill="none" stroke="#218559" d="M282.443,-694.446C273.158,-694.745 263.225,-694.824 253.602,-694.681"/>
+<polygon fill="#218559" stroke="#218559" points="253.407,-691.175 243.327,-694.438 253.242,-698.173 253.407,-691.175"/>
+</g>
+<!-- 5,4->6,2 -->
+<g id="edge101" class="edge"><title>5,4->6,2</title>
+<path fill="none" stroke="#dd1e2f" d="M353.779,-660.914C365.347,-650.026 376,-640 376,-640 376,-640 408.743,-563.749 430.371,-513.382"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="433.673,-514.563 434.403,-503.993 427.241,-511.801 433.673,-514.563"/>
+</g>
+<!-- 4,1 -->
+<g id="node31" class="node"><title>4,1</title>
+<ellipse fill="none" stroke="black" cx="59" cy="-261" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="39.5" y="-272.167" font-family="Times Roman,serif" font-size="10.00">4,1--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="37,-253 37,-267 82,-267 82,-253 37,-253"/>
+<text text-anchor="start" x="40" y="-257.667" font-family="Times Roman,serif" font-size="10.00">AATAGA</text>
+<polygon fill="#218559" stroke="#218559" points="37,-239 37,-253 82,-253 82,-239 37,-239"/>
+<text text-anchor="start" x="43" y="-243.667" font-family="Times Roman,serif" font-size="10.00">TCTATT</text>
+</g>
+<!-- 4,3 -->
+<g id="node32" class="node"><title>4,3</title>
+<ellipse fill="none" stroke="black" cx="201" cy="-261" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="181.5" y="-272.167" font-family="Times Roman,serif" font-size="10.00">4,3--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="179,-253 179,-267 224,-267 224,-253 179,-253"/>
+<text text-anchor="start" x="185" y="-257.667" font-family="Times Roman,serif" font-size="10.00">TAGAA</text>
+<polygon fill="#218559" stroke="#218559" points="179,-239 179,-253 224,-253 224,-239 179,-239"/>
+<text text-anchor="start" x="187.5" y="-243.667" font-family="Times Roman,serif" font-size="10.00">TTCTA</text>
+</g>
+<!-- 4,1->4,3 -->
+<g id="edge29" class="edge"><title>4,1->4,3</title>
+<path fill="none" stroke="#dd1e2f" d="M101.605,-254.755C116.207,-254.208 132.729,-254.105 148.049,-254.448"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="148.326,-257.957 158.425,-254.756 148.534,-250.96 148.326,-257.957"/>
+</g>
+<!-- 4,3->4,1 -->
+<g id="edge35" class="edge"><title>4,3->4,1</title>
+<path fill="none" stroke="#218559" d="M158.425,-267.244C143.825,-267.792 127.305,-267.895 111.982,-267.553"/>
+<polygon fill="#218559" stroke="#218559" points="111.704,-264.043 101.605,-267.245 111.497,-271.04 111.704,-264.043"/>
+</g>
+<!-- 4,4 -->
+<g id="node33" class="node"><title>4,4</title>
+<ellipse fill="none" stroke="black" cx="325" cy="-261" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="305.5" y="-272.167" font-family="Times Roman,serif" font-size="10.00">4,4--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="303,-253 303,-267 348,-267 348,-253 303,-253"/>
+<text text-anchor="start" x="307.5" y="-257.667" font-family="Times Roman,serif" font-size="10.00">AGAAG</text>
+<polygon fill="#218559" stroke="#218559" points="303,-239 303,-253 348,-253 348,-239 303,-239"/>
+<text text-anchor="start" x="311" y="-243.667" font-family="Times Roman,serif" font-size="10.00">CTTCT</text>
+</g>
+<!-- 4,3->4,4 -->
+<g id="edge33" class="edge"><title>4,3->4,4</title>
+<path fill="none" stroke="#dd1e2f" d="M243.327,-254.562C252.601,-254.258 262.531,-254.176 272.159,-254.316"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="272.364,-257.822 282.443,-254.554 272.527,-250.823 272.364,-257.822"/>
+</g>
+<!-- 4,3->6,1 -->
+<g id="edge31" class="edge"><title>4,3->6,1</title>
+<path fill="none" stroke="#dd1e2f" d="M238.738,-278.971C252.156,-285.36 264,-291 264,-291 264,-291 274,-412 274,-412 274,-412 282.58,-421.757 292.701,-433.268"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="290.268,-435.801 299.5,-441 295.525,-431.179 290.268,-435.801"/>
+</g>
+<!-- 4,4->4,3 -->
+<g id="edge39" class="edge"><title>4,4->4,3</title>
+<path fill="none" stroke="#218559" d="M282.443,-267.446C273.158,-267.745 263.225,-267.824 253.602,-267.681"/>
+<polygon fill="#218559" stroke="#218559" points="253.407,-264.175 243.327,-267.438 253.242,-271.173 253.407,-264.175"/>
+</g>
+<!-- 4,4->6,2 -->
+<g id="edge37" class="edge"><title>4,4->6,2</title>
+<path fill="none" stroke="#dd1e2f" d="M351.718,-289.414C368.888,-307.675 388,-328 388,-328 388,-328 412.394,-384.787 430.33,-426.538"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="427.226,-428.181 434.389,-435.987 433.658,-425.418 427.226,-428.181"/>
+</g>
+<!-- 6,1->1,3 -->
+<g id="edge45" class="edge"><title>6,1->1,3</title>
+<path fill="none" stroke="#218559" d="M286.368,-453.534C274.262,-448.374 264,-444 264,-444 264,-444 262,-444 262,-444 262,-444 236.975,-504.716 218.982,-548.371"/>
+<polygon fill="#218559" stroke="#218559" points="215.723,-547.095 215.148,-557.674 222.195,-549.762 215.723,-547.095"/>
+</g>
+<!-- 6,1->3,3 -->
+<g id="edge47" class="edge"><title>6,1->3,3</title>
+<path fill="none" stroke="#218559" d="M299.5,-441C286.75,-426.5 274,-412 274,-412 274,-412 264,-394 264,-394 264,-394 257.057,-390.694 247.781,-386.277"/>
+<polygon fill="#218559" stroke="#218559" points="249.272,-383.11 238.738,-381.971 246.262,-389.43 249.272,-383.11"/>
+</g>
+<!-- 6,1->2,3 -->
+<g id="edge43" class="edge"><title>6,1->2,3</title>
+<path fill="none" stroke="#218559" d="M303.371,-501.383C289.471,-521.551 274,-544 274,-544 274,-544 264,-629 264,-629 264,-629 244,-736 244,-736 244,-736 239.718,-740.779 233.857,-747.322"/>
+<polygon fill="#218559" stroke="#218559" points="231.071,-745.187 227.005,-754.971 236.285,-749.858 231.071,-745.187"/>
+</g>
+<!-- 6,1->5,3 -->
+<g id="edge51" class="edge"><title>6,1->5,3</title>
+<path fill="none" stroke="#218559" d="M293.131,-494.787C277.505,-506.941 262,-519 262,-519 262,-519 244,-640 244,-640 244,-640 239.718,-644.779 233.857,-651.322"/>
+<polygon fill="#218559" stroke="#218559" points="231.071,-649.187 227.005,-658.971 236.285,-653.858 231.071,-649.187"/>
+</g>
+<!-- 6,1->4,3 -->
+<g id="edge49" class="edge"><title>6,1->4,3</title>
+<path fill="none" stroke="#218559" d="M299.5,-441C286.75,-426.5 274,-412 274,-412 274,-412 264,-316 264,-316 264,-316 252.076,-305.59 238.602,-293.828"/>
+<polygon fill="#218559" stroke="#218559" points="240.859,-291.151 231.024,-287.211 236.255,-296.425 240.859,-291.151"/>
+</g>
+<!-- 6,1->6,2 -->
+<g id="edge41" class="edge"><title>6,1->6,2</title>
+<path fill="none" stroke="#dd1e2f" d="M367.327,-463.562C376.601,-463.258 386.531,-463.176 396.159,-463.316"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="396.364,-466.822 406.443,-463.554 396.527,-459.823 396.364,-466.822"/>
+</g>
+<!-- 6,2->1,4 -->
+<g id="edge59" class="edge"><title>6,2->1,4</title>
+<path fill="none" stroke="#218559" d="M423.484,-499.281C406.768,-518.463 388,-540 388,-540 388,-540 376.647,-549.37 363.581,-560.156"/>
+<polygon fill="#218559" stroke="#218559" points="361.246,-557.544 355.762,-566.609 365.702,-562.943 361.246,-557.544"/>
+</g>
+<!-- 6,2->3,4 -->
+<g id="edge57" class="edge"><title>6,2->3,4</title>
+<path fill="none" stroke="#218559" d="M418.55,-443.97C401.867,-429.709 381.029,-411.896 363.258,-396.704"/>
+<polygon fill="#218559" stroke="#218559" points="365.209,-393.768 355.334,-389.931 360.661,-399.089 365.209,-393.768"/>
+</g>
+<!-- 6,2->2,4 -->
+<g id="edge55" class="edge"><title>6,2->2,4</title>
+<path fill="none" stroke="#218559" d="M440.065,-505.448C423.121,-572.666 388,-712 388,-712 388,-712 376,-736 376,-736 376,-736 369.498,-742.119 361.137,-749.988"/>
+<polygon fill="#218559" stroke="#218559" points="358.662,-747.511 353.779,-756.914 363.46,-752.609 358.662,-747.511"/>
+</g>
+<!-- 6,2->5,4 -->
+<g id="edge63" class="edge"><title>6,2->5,4</title>
+<path fill="none" stroke="#218559" d="M436.802,-504.593C419.001,-555.079 388,-643 388,-643 388,-643 378.242,-649.97 366.407,-658.423"/>
+<polygon fill="#218559" stroke="#218559" points="364.079,-655.785 357.976,-664.446 368.148,-661.481 364.079,-655.785"/>
+</g>
+<!-- 6,2->4,4 -->
+<g id="edge61" class="edge"><title>6,2->4,4</title>
+<path fill="none" stroke="#218559" d="M432.98,-436.204C411.491,-390.872 376,-316 376,-316 376,-316 367.973,-307.343 358.288,-296.899"/>
+<polygon fill="#218559" stroke="#218559" points="360.762,-294.42 351.396,-289.467 355.629,-299.179 360.762,-294.42"/>
+</g>
+<!-- 6,2->6,1 -->
+<g id="edge65" class="edge"><title>6,2->6,1</title>
+<path fill="none" stroke="#218559" d="M406.443,-476.446C397.158,-476.745 387.225,-476.824 377.602,-476.681"/>
+<polygon fill="#218559" stroke="#218559" points="377.407,-473.175 367.327,-476.438 377.242,-480.173 377.407,-473.175"/>
+</g>
+<!-- 6,3 -->
+<g id="node37" class="node"><title>6,3</title>
+<ellipse fill="none" stroke="black" cx="576" cy="-470" rx="44.7575" ry="36.0624"/>
+<text text-anchor="start" x="556" y="-481.167" font-family="Times Roman,serif" font-size="10.00">6,3--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="552,-462 552,-476 600,-476 600,-462 552,-462"/>
+<text text-anchor="start" x="554.5" y="-466.667" font-family="Times Roman,serif" font-size="10.00">AAGAAG</text>
+<polygon fill="#218559" stroke="#218559" points="552,-448 552,-462 600,-462 600,-448 552,-448"/>
+<text text-anchor="start" x="559" y="-452.667" font-family="Times Roman,serif" font-size="10.00">CTTCTT</text>
+</g>
+<!-- 6,2->6,3 -->
+<g id="edge53" class="edge"><title>6,2->6,3</title>
+<path fill="none" stroke="#dd1e2f" d="M491.642,-463.585C501.055,-463.272 511.156,-463.178 520.981,-463.304"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="521.009,-466.805 531.079,-463.514 521.154,-459.807 521.009,-466.805"/>
+</g>
+<!-- 6,3->6,2 -->
+<g id="edge67" class="edge"><title>6,3->6,2</title>
+<path fill="none" stroke="#218559" d="M531.079,-476.486C521.562,-476.764 511.435,-476.822 501.66,-476.662"/>
+<polygon fill="#218559" stroke="#218559" points="501.726,-473.162 491.642,-476.415 501.553,-480.16 501.726,-473.162"/>
+</g>
+</g>
+</svg>
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_length1_bubbles/.part-0.crc b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_length1_bubbles/.part-0.crc
new file mode 100644
index 0000000..53d1b45
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_length1_bubbles/.part-0.crc
Binary files differ
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_length1_bubbles/.part-1.crc b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_length1_bubbles/.part-1.crc
new file mode 100644
index 0000000..e76bd36
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_length1_bubbles/.part-1.crc
Binary files differ
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_length1_bubbles/part-0 b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_length1_bubbles/part-0
new file mode 100755
index 0000000..a9f8b84
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_length1_bubbles/part-0
Binary files differ
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_length1_bubbles/part-1 b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_length1_bubbles/part-1
new file mode 100755
index 0000000..f1c5899
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/five_length1_bubbles/part-1
Binary files differ
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble.txt b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble.txt
new file mode 100644
index 0000000..51cc418
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble.txt
@@ -0,0 +1,6 @@
+((2,1) [(2,3)] [] [] [] GGAATA) (null)
+((2,3) [(2,4)] [(1,4)] [] [(2,1)] AATAC) (null)
+((2,4) [] [(1,3)] [] [(2,3)] ATACG) (null)
+((1,1) [(1,3)] [] [] [] AAACGT) (null)
+((1,3) [(1,4)] [(2,4)] [] [(1,1)] ACGTA) (null)
+((1,4) [] [(2,3)] [] [(1,3)] CGTAT) (null)
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble.txt.svg b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble.txt.svg
new file mode 100644
index 0000000..cb1b291
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble.txt.svg
@@ -0,0 +1,193 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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+ "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<!-- Generated by graphviz version 2.26.3 (20100126.1600)
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+ viewBox="0.00 0.00 392.00 428.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+<g id="graph1" class="graph" transform="scale(1 1) rotate(0) translate(4 424)">
+<title>fr_bubble_txt</title>
+<polygon fill="white" stroke="white" points="-4,5 -4,-424 389,-424 389,5 -4,5"/>
+<g id="graph2" class="cluster"><title>cluster_legend</title>
+<polygon fill="none" stroke="black" points="49,-8 49,-209 211,-209 211,-8 49,-8"/>
+<text text-anchor="middle" x="130" y="-192.4" font-family="Times Roman,serif" font-size="14.00">legend</text>
+</g>
+<g id="graph3" class="cluster"><title>cluster_1</title>
+<polygon fill="none" stroke="black" points="8,-217 8,-305 376,-305 376,-217 8,-217"/>
+</g>
+<g id="graph4" class="cluster"><title>cluster_2</title>
+<polygon fill="none" stroke="black" points="8,-324 8,-412 376,-412 376,-324 8,-324"/>
+</g>
+<!-- legend_0_0 -->
+<g id="node2" class="node"><title>legend_0_0</title>
+<ellipse fill="black" stroke="black" cx="59" cy="-157" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_1_0 -->
+<g id="node3" class="node"><title>legend_1_0</title>
+<ellipse fill="black" stroke="black" cx="201" cy="-157" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_0_0->legend_1_0 -->
+<g id="edge3" class="edge"><title>legend_0_0->legend_1_0</title>
+<path fill="none" stroke="#dd1e2f" d="M61.0074,-157C74.8673,-157 156.744,-157 188.46,-157"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="188.862,-160.5 198.862,-157 188.861,-153.5 188.862,-160.5"/>
+<text text-anchor="middle" x="130" y="-162.4" font-family="Times Roman,serif" font-size="14.00">FF</text>
+</g>
+<!-- legend_0_1 -->
+<g id="node5" class="node"><title>legend_0_1</title>
+<ellipse fill="black" stroke="black" cx="59" cy="-116" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_1_1 -->
+<g id="node6" class="node"><title>legend_1_1</title>
+<ellipse fill="black" stroke="black" cx="201" cy="-116" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_0_1->legend_1_1 -->
+<g id="edge5" class="edge"><title>legend_0_1->legend_1_1</title>
+<path fill="none" stroke="#ebb035" d="M61.0074,-116C74.8673,-116 156.744,-116 188.46,-116"/>
+<polygon fill="#ebb035" stroke="#ebb035" points="188.862,-119.5 198.862,-116 188.861,-112.5 188.862,-119.5"/>
+<text text-anchor="middle" x="130" y="-121.4" font-family="Times Roman,serif" font-size="14.00">FR</text>
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+<!-- legend_0_2 -->
+<g id="node8" class="node"><title>legend_0_2</title>
+<ellipse fill="black" stroke="black" cx="59" cy="-75" rx="1.8" ry="1.8"/>
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+<!-- legend_1_2 -->
+<g id="node9" class="node"><title>legend_1_2</title>
+<ellipse fill="black" stroke="black" cx="201" cy="-75" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_0_2->legend_1_2 -->
+<g id="edge7" class="edge"><title>legend_0_2->legend_1_2</title>
+<path fill="none" stroke="#06a2cb" d="M61.0074,-75C74.8673,-75 156.744,-75 188.46,-75"/>
+<polygon fill="#06a2cb" stroke="#06a2cb" points="188.862,-78.5001 198.862,-75 188.861,-71.5001 188.862,-78.5001"/>
+<text text-anchor="middle" x="130" y="-80.4" font-family="Times Roman,serif" font-size="14.00">RF</text>
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+<!-- legend_0_3 -->
+<g id="node11" class="node"><title>legend_0_3</title>
+<ellipse fill="black" stroke="black" cx="59" cy="-34" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_1_3 -->
+<g id="node12" class="node"><title>legend_1_3</title>
+<ellipse fill="black" stroke="black" cx="201" cy="-34" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_0_3->legend_1_3 -->
+<g id="edge9" class="edge"><title>legend_0_3->legend_1_3</title>
+<path fill="none" stroke="#218559" d="M61.0074,-34C74.8673,-34 156.744,-34 188.46,-34"/>
+<polygon fill="#218559" stroke="#218559" points="188.862,-37.5001 198.862,-34 188.861,-30.5001 188.862,-37.5001"/>
+<text text-anchor="middle" x="130" y="-39.4" font-family="Times Roman,serif" font-size="14.00">RR</text>
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+<!-- 1,1 -->
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+<ellipse fill="none" stroke="black" cx="59" cy="-261" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="39.5" y="-272.167" font-family="Times Roman,serif" font-size="10.00">1,1--null</text>
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+<text text-anchor="start" x="39.5" y="-257.667" font-family="Times Roman,serif" font-size="10.00">AAACGT</text>
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+<text text-anchor="start" x="181.5" y="-272.167" font-family="Times Roman,serif" font-size="10.00">1,3--null</text>
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+<polygon fill="#218559" stroke="#218559" points="179,-239 179,-253 224,-253 224,-239 179,-239"/>
+<text text-anchor="start" x="186" y="-243.667" font-family="Times Roman,serif" font-size="10.00">TACGT</text>
+</g>
+<!-- 1,1->1,3 -->
+<g id="edge25" class="edge"><title>1,1->1,3</title>
+<path fill="none" stroke="#dd1e2f" d="M101.605,-254.755C116.207,-254.208 132.729,-254.105 148.049,-254.448"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="148.326,-257.957 158.425,-254.756 148.534,-250.96 148.326,-257.957"/>
+</g>
+<!-- 1,3->1,1 -->
+<g id="edge31" class="edge"><title>1,3->1,1</title>
+<path fill="none" stroke="#218559" d="M158.425,-267.244C143.825,-267.792 127.305,-267.895 111.982,-267.553"/>
+<polygon fill="#218559" stroke="#218559" points="111.704,-264.043 101.605,-267.245 111.497,-271.04 111.704,-264.043"/>
+</g>
+<!-- 1,4 -->
+<g id="node17" class="node"><title>1,4</title>
+<ellipse fill="none" stroke="black" cx="325" cy="-261" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="305.5" y="-272.167" font-family="Times Roman,serif" font-size="10.00">1,4--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="303,-253 303,-267 348,-267 348,-253 303,-253"/>
+<text text-anchor="start" x="310.5" y="-257.667" font-family="Times Roman,serif" font-size="10.00">CGTAT</text>
+<polygon fill="#218559" stroke="#218559" points="303,-239 303,-253 348,-253 348,-239 303,-239"/>
+<text text-anchor="start" x="309.5" y="-243.667" font-family="Times Roman,serif" font-size="10.00">ATACG</text>
+</g>
+<!-- 1,3->1,4 -->
+<g id="edge27" class="edge"><title>1,3->1,4</title>
+<path fill="none" stroke="#dd1e2f" d="M243.327,-254.562C252.601,-254.258 262.531,-254.176 272.159,-254.316"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="272.364,-257.822 282.443,-254.554 272.527,-250.823 272.364,-257.822"/>
+</g>
+<!-- 2,4 -->
+<g id="node21" class="node"><title>2,4</title>
+<ellipse fill="none" stroke="black" cx="325" cy="-368" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="305.5" y="-379.167" font-family="Times Roman,serif" font-size="10.00">2,4--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="303,-360 303,-374 348,-374 348,-360 303,-360"/>
+<text text-anchor="start" x="309.5" y="-364.667" font-family="Times Roman,serif" font-size="10.00">ATACG</text>
+<polygon fill="#218559" stroke="#218559" points="303,-346 303,-360 348,-360 348,-346 303,-346"/>
+<text text-anchor="start" x="310.5" y="-350.667" font-family="Times Roman,serif" font-size="10.00">CGTAT</text>
+</g>
+<!-- 1,3->2,4 -->
+<g id="edge29" class="edge"><title>1,3->2,4</title>
+<path fill="none" stroke="#ebb035" d="M231.017,-286.902C247.799,-301.383 268.887,-319.58 286.832,-335.065"/>
+<polygon fill="#ebb035" stroke="#ebb035" points="284.972,-338.083 294.83,-341.966 289.545,-332.783 284.972,-338.083"/>
+</g>
+<!-- 1,4->1,3 -->
+<g id="edge35" class="edge"><title>1,4->1,3</title>
+<path fill="none" stroke="#218559" d="M282.443,-267.446C273.158,-267.745 263.225,-267.824 253.602,-267.681"/>
+<polygon fill="#218559" stroke="#218559" points="253.407,-264.175 243.327,-267.438 253.242,-271.173 253.407,-264.175"/>
+</g>
+<!-- 2,3 -->
+<g id="node20" class="node"><title>2,3</title>
+<ellipse fill="none" stroke="black" cx="201" cy="-368" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="181.5" y="-379.167" font-family="Times Roman,serif" font-size="10.00">2,3--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="179,-360 179,-374 224,-374 224,-360 179,-360"/>
+<text text-anchor="start" x="186" y="-364.667" font-family="Times Roman,serif" font-size="10.00">AATAC</text>
+<polygon fill="#218559" stroke="#218559" points="179,-346 179,-360 224,-360 224,-346 179,-346"/>
+<text text-anchor="start" x="187.5" y="-350.667" font-family="Times Roman,serif" font-size="10.00">GTATT</text>
+</g>
+<!-- 1,4->2,3 -->
+<g id="edge33" class="edge"><title>1,4->2,3</title>
+<path fill="none" stroke="#ebb035" d="M299.131,-289.838C282.505,-308.372 264,-329 264,-329 264,-329 255.356,-334.351 244.471,-341.089"/>
+<polygon fill="#ebb035" stroke="#ebb035" points="242.477,-338.207 235.817,-346.447 246.162,-344.159 242.477,-338.207"/>
+</g>
+<!-- 2,1 -->
+<g id="node19" class="node"><title>2,1</title>
+<ellipse fill="none" stroke="black" cx="59" cy="-368" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="39.5" y="-379.167" font-family="Times Roman,serif" font-size="10.00">2,1--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="37,-360 37,-374 82,-374 82,-360 37,-360"/>
+<text text-anchor="start" x="39.5" y="-364.667" font-family="Times Roman,serif" font-size="10.00">GGAATA</text>
+<polygon fill="#218559" stroke="#218559" points="37,-346 37,-360 82,-360 82,-346 37,-346"/>
+<text text-anchor="start" x="42.5" y="-350.667" font-family="Times Roman,serif" font-size="10.00">TATTCC</text>
+</g>
+<!-- 2,1->2,3 -->
+<g id="edge13" class="edge"><title>2,1->2,3</title>
+<path fill="none" stroke="#dd1e2f" d="M101.605,-361.755C116.207,-361.208 132.729,-361.105 148.049,-361.448"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="148.326,-364.957 158.425,-361.756 148.534,-357.96 148.326,-364.957"/>
+</g>
+<!-- 2,3->1,4 -->
+<g id="edge17" class="edge"><title>2,3->1,4</title>
+<path fill="none" stroke="#ebb035" d="M231.017,-342.098C247.799,-327.617 268.887,-309.42 286.832,-293.935"/>
+<polygon fill="#ebb035" stroke="#ebb035" points="289.545,-296.217 294.83,-287.034 284.972,-290.917 289.545,-296.217"/>
+</g>
+<!-- 2,3->2,1 -->
+<g id="edge19" class="edge"><title>2,3->2,1</title>
+<path fill="none" stroke="#218559" d="M158.425,-374.244C143.825,-374.792 127.305,-374.895 111.982,-374.553"/>
+<polygon fill="#218559" stroke="#218559" points="111.704,-371.043 101.605,-374.245 111.497,-378.04 111.704,-371.043"/>
+</g>
+<!-- 2,3->2,4 -->
+<g id="edge15" class="edge"><title>2,3->2,4</title>
+<path fill="none" stroke="#dd1e2f" d="M243.327,-361.562C252.601,-361.258 262.531,-361.176 272.159,-361.316"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="272.364,-364.822 282.443,-361.554 272.527,-357.823 272.364,-364.822"/>
+</g>
+<!-- 2,4->1,3 -->
+<g id="edge21" class="edge"><title>2,4->1,3</title>
+<path fill="none" stroke="#ebb035" d="M294.83,-341.966C278.021,-327.462 256.93,-309.262 239.004,-293.794"/>
+<polygon fill="#ebb035" stroke="#ebb035" points="240.875,-290.785 231.017,-286.902 236.301,-296.085 240.875,-290.785"/>
+</g>
+<!-- 2,4->2,3 -->
+<g id="edge23" class="edge"><title>2,4->2,3</title>
+<path fill="none" stroke="#218559" d="M282.443,-374.446C273.158,-374.745 263.225,-374.824 253.602,-374.681"/>
+<polygon fill="#218559" stroke="#218559" points="253.407,-371.175 243.327,-374.438 253.242,-378.173 253.407,-371.175"/>
+</g>
+</g>
+</svg>
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble/.part-0.crc b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble/.part-0.crc
new file mode 100644
index 0000000..d40cb4d
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble/.part-0.crc
Binary files differ
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble/.part-1.crc b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble/.part-1.crc
new file mode 100644
index 0000000..bc50c79
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble/.part-1.crc
Binary files differ
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble/part-0 b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble/part-0
new file mode 100755
index 0000000..f757027
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble/part-0
Binary files differ
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble/part-1 b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble/part-1
new file mode 100755
index 0000000..96978fb
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble/part-1
Binary files differ
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble_and_ff_bubble.txt b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble_and_ff_bubble.txt
new file mode 100644
index 0000000..b53f352
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble_and_ff_bubble.txt
@@ -0,0 +1,9 @@
+((2,1) [(2,2)] [] [] [(1,3)] CGTAT) (null)
+((2,2) [(2,3)] [] [] [(1,4),(2,1)] GTATT) (null)
+((2,3) [] [] [] [(2,2)] TATTCC) (null)
+((1,1) [(1,3)] [] [] [] AAACGT) (null)
+((1,3) [(2,1),(1,4)] [(3,4)] [] [(1,1)] ACGTA) (null)
+((1,4) [(2,2)] [(3,3)] [] [(1,3)] CGTAT) (null)
+((3,1) [(3,3)] [] [] [] GGAATA) (null)
+((3,3) [(3,4)] [(1,4)] [] [(3,1)] AATAC) (null)
+((3,4) [] [(1,3)] [] [(3,3)] ATACG) (null)
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble_and_ff_bubble.txt.svg b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble_and_ff_bubble.txt.svg
new file mode 100644
index 0000000..aaaab66
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble_and_ff_bubble.txt.svg
@@ -0,0 +1,263 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
+ "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<!-- Generated by graphviz version 2.26.3 (20100126.1600)
+ -->
+<!-- Title: fr_bubble_and_ff_bubble_txt Pages: 1 -->
+<svg width="640pt" height="428pt"
+ viewBox="0.00 0.00 640.00 428.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+<g id="graph1" class="graph" transform="scale(1 1) rotate(0) translate(4 424)">
+<title>fr_bubble_and_ff_bubble_txt</title>
+<polygon fill="white" stroke="white" points="-4,5 -4,-424 637,-424 637,5 -4,5"/>
+<g id="graph2" class="cluster"><title>cluster_legend</title>
+<polygon fill="none" stroke="black" points="49,-8 49,-209 211,-209 211,-8 49,-8"/>
+<text text-anchor="middle" x="130" y="-192.4" font-family="Times Roman,serif" font-size="14.00">legend</text>
+</g>
+<g id="graph3" class="cluster"><title>cluster_1</title>
+<polygon fill="none" stroke="black" points="8,-217 8,-305 376,-305 376,-217 8,-217"/>
+</g>
+<g id="graph4" class="cluster"><title>cluster_3</title>
+<polygon fill="none" stroke="black" points="8,-324 8,-412 376,-412 376,-324 8,-324"/>
+</g>
+<g id="graph5" class="cluster"><title>cluster_2</title>
+<polygon fill="none" stroke="black" points="274,-121 274,-209 624,-209 624,-121 274,-121"/>
+</g>
+<!-- legend_0_0 -->
+<g id="node2" class="node"><title>legend_0_0</title>
+<ellipse fill="black" stroke="black" cx="59" cy="-157" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_1_0 -->
+<g id="node3" class="node"><title>legend_1_0</title>
+<ellipse fill="black" stroke="black" cx="201" cy="-157" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_0_0->legend_1_0 -->
+<g id="edge3" class="edge"><title>legend_0_0->legend_1_0</title>
+<path fill="none" stroke="#dd1e2f" d="M61.0074,-157C74.8673,-157 156.744,-157 188.46,-157"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="188.862,-160.5 198.862,-157 188.861,-153.5 188.862,-160.5"/>
+<text text-anchor="middle" x="130" y="-162.4" font-family="Times Roman,serif" font-size="14.00">FF</text>
+</g>
+<!-- legend_0_1 -->
+<g id="node5" class="node"><title>legend_0_1</title>
+<ellipse fill="black" stroke="black" cx="59" cy="-116" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_1_1 -->
+<g id="node6" class="node"><title>legend_1_1</title>
+<ellipse fill="black" stroke="black" cx="201" cy="-116" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_0_1->legend_1_1 -->
+<g id="edge5" class="edge"><title>legend_0_1->legend_1_1</title>
+<path fill="none" stroke="#ebb035" d="M61.0074,-116C74.8673,-116 156.744,-116 188.46,-116"/>
+<polygon fill="#ebb035" stroke="#ebb035" points="188.862,-119.5 198.862,-116 188.861,-112.5 188.862,-119.5"/>
+<text text-anchor="middle" x="130" y="-121.4" font-family="Times Roman,serif" font-size="14.00">FR</text>
+</g>
+<!-- legend_0_2 -->
+<g id="node8" class="node"><title>legend_0_2</title>
+<ellipse fill="black" stroke="black" cx="59" cy="-75" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_1_2 -->
+<g id="node9" class="node"><title>legend_1_2</title>
+<ellipse fill="black" stroke="black" cx="201" cy="-75" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_0_2->legend_1_2 -->
+<g id="edge7" class="edge"><title>legend_0_2->legend_1_2</title>
+<path fill="none" stroke="#06a2cb" d="M61.0074,-75C74.8673,-75 156.744,-75 188.46,-75"/>
+<polygon fill="#06a2cb" stroke="#06a2cb" points="188.862,-78.5001 198.862,-75 188.861,-71.5001 188.862,-78.5001"/>
+<text text-anchor="middle" x="130" y="-80.4" font-family="Times Roman,serif" font-size="14.00">RF</text>
+</g>
+<!-- legend_0_3 -->
+<g id="node11" class="node"><title>legend_0_3</title>
+<ellipse fill="black" stroke="black" cx="59" cy="-34" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_1_3 -->
+<g id="node12" class="node"><title>legend_1_3</title>
+<ellipse fill="black" stroke="black" cx="201" cy="-34" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_0_3->legend_1_3 -->
+<g id="edge9" class="edge"><title>legend_0_3->legend_1_3</title>
+<path fill="none" stroke="#218559" d="M61.0074,-34C74.8673,-34 156.744,-34 188.46,-34"/>
+<polygon fill="#218559" stroke="#218559" points="188.862,-37.5001 198.862,-34 188.861,-30.5001 188.862,-37.5001"/>
+<text text-anchor="middle" x="130" y="-39.4" font-family="Times Roman,serif" font-size="14.00">RR</text>
+</g>
+<!-- 1,1 -->
+<g id="node15" class="node"><title>1,1</title>
+<ellipse fill="none" stroke="black" cx="59" cy="-261" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="39.5" y="-272.167" font-family="Times Roman,serif" font-size="10.00">1,1--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="37,-253 37,-267 82,-267 82,-253 37,-253"/>
+<text text-anchor="start" x="39.5" y="-257.667" font-family="Times Roman,serif" font-size="10.00">AAACGT</text>
+<polygon fill="#218559" stroke="#218559" points="37,-239 37,-253 82,-253 82,-239 37,-239"/>
+<text text-anchor="start" x="41.5" y="-243.667" font-family="Times Roman,serif" font-size="10.00">ACGTTT</text>
+</g>
+<!-- 1,3 -->
+<g id="node16" class="node"><title>1,3</title>
+<ellipse fill="none" stroke="black" cx="201" cy="-261" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="181.5" y="-272.167" font-family="Times Roman,serif" font-size="10.00">1,3--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="179,-253 179,-267 224,-267 224,-253 179,-253"/>
+<text text-anchor="start" x="185.5" y="-257.667" font-family="Times Roman,serif" font-size="10.00">ACGTA</text>
+<polygon fill="#218559" stroke="#218559" points="179,-239 179,-253 224,-253 224,-239 179,-239"/>
+<text text-anchor="start" x="186" y="-243.667" font-family="Times Roman,serif" font-size="10.00">TACGT</text>
+</g>
+<!-- 1,1->1,3 -->
+<g id="edge26" class="edge"><title>1,1->1,3</title>
+<path fill="none" stroke="#dd1e2f" d="M101.605,-254.755C116.207,-254.208 132.729,-254.105 148.049,-254.448"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="148.326,-257.957 158.425,-254.756 148.534,-250.96 148.326,-257.957"/>
+</g>
+<!-- 1,3->1,1 -->
+<g id="edge34" class="edge"><title>1,3->1,1</title>
+<path fill="none" stroke="#218559" d="M158.425,-267.244C143.825,-267.792 127.305,-267.895 111.982,-267.553"/>
+<polygon fill="#218559" stroke="#218559" points="111.704,-264.043 101.605,-267.245 111.497,-271.04 111.704,-264.043"/>
+</g>
+<!-- 1,4 -->
+<g id="node17" class="node"><title>1,4</title>
+<ellipse fill="none" stroke="black" cx="325" cy="-261" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="305.5" y="-272.167" font-family="Times Roman,serif" font-size="10.00">1,4--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="303,-253 303,-267 348,-267 348,-253 303,-253"/>
+<text text-anchor="start" x="310.5" y="-257.667" font-family="Times Roman,serif" font-size="10.00">CGTAT</text>
+<polygon fill="#218559" stroke="#218559" points="303,-239 303,-253 348,-253 348,-239 303,-239"/>
+<text text-anchor="start" x="309.5" y="-243.667" font-family="Times Roman,serif" font-size="10.00">ATACG</text>
+</g>
+<!-- 1,3->1,4 -->
+<g id="edge30" class="edge"><title>1,3->1,4</title>
+<path fill="none" stroke="#dd1e2f" d="M243.327,-254.562C252.601,-254.258 262.531,-254.176 272.159,-254.316"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="272.364,-257.822 282.443,-254.554 272.527,-250.823 272.364,-257.822"/>
+</g>
+<!-- 3,4 -->
+<g id="node21" class="node"><title>3,4</title>
+<ellipse fill="none" stroke="black" cx="325" cy="-368" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="305.5" y="-379.167" font-family="Times Roman,serif" font-size="10.00">3,4--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="303,-360 303,-374 348,-374 348,-360 303,-360"/>
+<text text-anchor="start" x="309.5" y="-364.667" font-family="Times Roman,serif" font-size="10.00">ATACG</text>
+<polygon fill="#218559" stroke="#218559" points="303,-346 303,-360 348,-360 348,-346 303,-346"/>
+<text text-anchor="start" x="310.5" y="-350.667" font-family="Times Roman,serif" font-size="10.00">CGTAT</text>
+</g>
+<!-- 1,3->3,4 -->
+<g id="edge32" class="edge"><title>1,3->3,4</title>
+<path fill="none" stroke="#ebb035" d="M231.017,-286.902C247.799,-301.383 268.887,-319.58 286.832,-335.065"/>
+<polygon fill="#ebb035" stroke="#ebb035" points="284.972,-338.083 294.83,-341.966 289.545,-332.783 284.972,-338.083"/>
+</g>
+<!-- 2,1 -->
+<g id="node23" class="node"><title>2,1</title>
+<ellipse fill="none" stroke="black" cx="325" cy="-165" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="305.5" y="-176.167" font-family="Times Roman,serif" font-size="10.00">2,1--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="303,-157 303,-171 348,-171 348,-157 303,-157"/>
+<text text-anchor="start" x="310.5" y="-161.667" font-family="Times Roman,serif" font-size="10.00">CGTAT</text>
+<polygon fill="#218559" stroke="#218559" points="303,-143 303,-157 348,-157 348,-143 303,-143"/>
+<text text-anchor="start" x="309.5" y="-147.667" font-family="Times Roman,serif" font-size="10.00">ATACG</text>
+</g>
+<!-- 1,3->2,1 -->
+<g id="edge28" class="edge"><title>1,3->2,1</title>
+<path fill="none" stroke="#dd1e2f" d="M234.345,-237.712C249.456,-227.157 264,-217 264,-217 264,-217 274.622,-207.945 287.002,-197.392"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="289.518,-199.846 294.857,-190.695 284.977,-194.519 289.518,-199.846"/>
+</g>
+<!-- 1,4->1,3 -->
+<g id="edge40" class="edge"><title>1,4->1,3</title>
+<path fill="none" stroke="#218559" d="M282.443,-267.446C273.158,-267.745 263.225,-267.824 253.602,-267.681"/>
+<polygon fill="#218559" stroke="#218559" points="253.407,-264.175 243.327,-267.438 253.242,-271.173 253.407,-264.175"/>
+</g>
+<!-- 3,3 -->
+<g id="node20" class="node"><title>3,3</title>
+<ellipse fill="none" stroke="black" cx="201" cy="-368" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="181.5" y="-379.167" font-family="Times Roman,serif" font-size="10.00">3,3--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="179,-360 179,-374 224,-374 224,-360 179,-360"/>
+<text text-anchor="start" x="186" y="-364.667" font-family="Times Roman,serif" font-size="10.00">AATAC</text>
+<polygon fill="#218559" stroke="#218559" points="179,-346 179,-360 224,-360 224,-346 179,-346"/>
+<text text-anchor="start" x="187.5" y="-350.667" font-family="Times Roman,serif" font-size="10.00">GTATT</text>
+</g>
+<!-- 1,4->3,3 -->
+<g id="edge38" class="edge"><title>1,4->3,3</title>
+<path fill="none" stroke="#ebb035" d="M294.83,-287.034C278.021,-301.538 256.93,-319.738 239.004,-335.206"/>
+<polygon fill="#ebb035" stroke="#ebb035" points="236.301,-332.915 231.017,-342.098 240.875,-338.215 236.301,-332.915"/>
+</g>
+<!-- 2,2 -->
+<g id="node24" class="node"><title>2,2</title>
+<ellipse fill="none" stroke="black" cx="449" cy="-165" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="429.5" y="-176.167" font-family="Times Roman,serif" font-size="10.00">2,2--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="427,-157 427,-171 472,-171 472,-157 427,-157"/>
+<text text-anchor="start" x="435.5" y="-161.667" font-family="Times Roman,serif" font-size="10.00">GTATT</text>
+<polygon fill="#218559" stroke="#218559" points="427,-143 427,-157 472,-157 472,-143 427,-143"/>
+<text text-anchor="start" x="434" y="-147.667" font-family="Times Roman,serif" font-size="10.00">AATAC</text>
+</g>
+<!-- 1,4->2,2 -->
+<g id="edge36" class="edge"><title>1,4->2,2</title>
+<path fill="none" stroke="#dd1e2f" d="M356.611,-236.527C372.521,-224.21 391.976,-209.147 408.924,-196.027"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="411.251,-198.652 417.015,-189.762 406.965,-193.117 411.251,-198.652"/>
+</g>
+<!-- 3,1 -->
+<g id="node19" class="node"><title>3,1</title>
+<ellipse fill="none" stroke="black" cx="59" cy="-368" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="39.5" y="-379.167" font-family="Times Roman,serif" font-size="10.00">3,1--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="37,-360 37,-374 82,-374 82,-360 37,-360"/>
+<text text-anchor="start" x="39.5" y="-364.667" font-family="Times Roman,serif" font-size="10.00">GGAATA</text>
+<polygon fill="#218559" stroke="#218559" points="37,-346 37,-360 82,-360 82,-346 37,-346"/>
+<text text-anchor="start" x="42.5" y="-350.667" font-family="Times Roman,serif" font-size="10.00">TATTCC</text>
+</g>
+<!-- 3,1->3,3 -->
+<g id="edge42" class="edge"><title>3,1->3,3</title>
+<path fill="none" stroke="#dd1e2f" d="M101.605,-361.755C116.207,-361.208 132.729,-361.105 148.049,-361.448"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="148.326,-364.957 158.425,-361.756 148.534,-357.96 148.326,-364.957"/>
+</g>
+<!-- 3,3->1,4 -->
+<g id="edge46" class="edge"><title>3,3->1,4</title>
+<path fill="none" stroke="#ebb035" d="M229.714,-341.169C245.535,-326.385 262,-311 262,-311 262,-311 272.801,-302.428 285.459,-292.382"/>
+<polygon fill="#ebb035" stroke="#ebb035" points="287.843,-294.958 293.5,-286 283.491,-289.475 287.843,-294.958"/>
+</g>
+<!-- 3,3->3,1 -->
+<g id="edge48" class="edge"><title>3,3->3,1</title>
+<path fill="none" stroke="#218559" d="M158.425,-374.244C143.825,-374.792 127.305,-374.895 111.982,-374.553"/>
+<polygon fill="#218559" stroke="#218559" points="111.704,-371.043 101.605,-374.245 111.497,-378.04 111.704,-371.043"/>
+</g>
+<!-- 3,3->3,4 -->
+<g id="edge44" class="edge"><title>3,3->3,4</title>
+<path fill="none" stroke="#dd1e2f" d="M243.327,-361.562C252.601,-361.258 262.531,-361.176 272.159,-361.316"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="272.364,-364.822 282.443,-361.554 272.527,-357.823 272.364,-364.822"/>
+</g>
+<!-- 3,4->1,3 -->
+<g id="edge50" class="edge"><title>3,4->1,3</title>
+<path fill="none" stroke="#ebb035" d="M294.83,-341.966C278.021,-327.462 256.93,-309.262 239.004,-293.794"/>
+<polygon fill="#ebb035" stroke="#ebb035" points="240.875,-290.785 231.017,-286.902 236.301,-296.085 240.875,-290.785"/>
+</g>
+<!-- 3,4->3,3 -->
+<g id="edge52" class="edge"><title>3,4->3,3</title>
+<path fill="none" stroke="#218559" d="M282.443,-374.446C273.158,-374.745 263.225,-374.824 253.602,-374.681"/>
+<polygon fill="#218559" stroke="#218559" points="253.407,-371.175 243.327,-374.438 253.242,-378.173 253.407,-371.175"/>
+</g>
+<!-- 2,1->1,3 -->
+<g id="edge16" class="edge"><title>2,1->1,3</title>
+<path fill="none" stroke="#218559" d="M293.015,-189.762C277.051,-202.122 257.587,-217.19 240.68,-230.28"/>
+<polygon fill="#218559" stroke="#218559" points="238.376,-227.637 232.611,-236.527 242.661,-233.173 238.376,-227.637"/>
+</g>
+<!-- 2,1->2,2 -->
+<g id="edge14" class="edge"><title>2,1->2,2</title>
+<path fill="none" stroke="#dd1e2f" d="M367.327,-158.562C376.601,-158.258 386.531,-158.176 396.159,-158.316"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="396.364,-161.822 406.443,-158.554 396.527,-154.823 396.364,-161.822"/>
+</g>
+<!-- 2,2->1,4 -->
+<g id="edge20" class="edge"><title>2,2->1,4</title>
+<path fill="none" stroke="#218559" d="M420.286,-191.831C404.465,-206.615 388,-222 388,-222 388,-222 379.356,-227.351 368.471,-234.089"/>
+<polygon fill="#218559" stroke="#218559" points="366.477,-231.207 359.817,-239.447 370.162,-237.159 366.477,-231.207"/>
+</g>
+<!-- 2,2->2,1 -->
+<g id="edge22" class="edge"><title>2,2->2,1</title>
+<path fill="none" stroke="#218559" d="M406.443,-171.446C397.158,-171.745 387.225,-171.824 377.602,-171.681"/>
+<polygon fill="#218559" stroke="#218559" points="377.407,-168.175 367.327,-171.438 377.242,-175.173 377.407,-168.175"/>
+</g>
+<!-- 2,3 -->
+<g id="node25" class="node"><title>2,3</title>
+<ellipse fill="none" stroke="black" cx="573" cy="-165" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="553.5" y="-176.167" font-family="Times Roman,serif" font-size="10.00">2,3--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="551,-157 551,-171 596,-171 596,-157 551,-157"/>
+<text text-anchor="start" x="556.5" y="-161.667" font-family="Times Roman,serif" font-size="10.00">TATTCC</text>
+<polygon fill="#218559" stroke="#218559" points="551,-143 551,-157 596,-157 596,-143 551,-143"/>
+<text text-anchor="start" x="553.5" y="-147.667" font-family="Times Roman,serif" font-size="10.00">GGAATA</text>
+</g>
+<!-- 2,2->2,3 -->
+<g id="edge18" class="edge"><title>2,2->2,3</title>
+<path fill="none" stroke="#dd1e2f" d="M491.327,-158.562C500.601,-158.258 510.531,-158.176 520.159,-158.316"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="520.364,-161.822 530.443,-158.554 520.527,-154.823 520.364,-161.822"/>
+</g>
+<!-- 2,3->2,2 -->
+<g id="edge24" class="edge"><title>2,3->2,2</title>
+<path fill="none" stroke="#218559" d="M530.443,-171.446C521.158,-171.745 511.225,-171.824 501.602,-171.681"/>
+<polygon fill="#218559" stroke="#218559" points="501.407,-168.175 491.327,-171.438 501.242,-175.173 501.407,-168.175"/>
+</g>
+</g>
+</svg>
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble_and_ff_bubble/.part-0.crc b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble_and_ff_bubble/.part-0.crc
new file mode 100644
index 0000000..528de91
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble_and_ff_bubble/.part-0.crc
Binary files differ
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble_and_ff_bubble/.part-1.crc b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble_and_ff_bubble/.part-1.crc
new file mode 100644
index 0000000..247ccc7
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble_and_ff_bubble/.part-1.crc
Binary files differ
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble_and_ff_bubble/part-0 b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble_and_ff_bubble/part-0
new file mode 100755
index 0000000..795d0c7
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble_and_ff_bubble/part-0
Binary files differ
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble_and_ff_bubble/part-1 b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble_and_ff_bubble/part-1
new file mode 100755
index 0000000..8a0aa72
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/fr_bubble_and_ff_bubble/part-1
Binary files differ
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/rf_bubble.txt b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/rf_bubble.txt
new file mode 100644
index 0000000..8b0bfdc
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/rf_bubble.txt
@@ -0,0 +1,6 @@
+((2,1) [(2,2)] [] [(1,2)] [] ACCGT) (null)
+((2,2) [(2,3)] [] [(1,1)] [(2,1)] CCGTG) (null)
+((2,3) [] [] [] [(2,2)] CGTGGT) (null)
+((1,1) [(1,2)] [] [(2,2)] [] ACGGT) (null)
+((1,2) [(1,3)] [] [(2,1)] [(1,1)] CGGTG) (null)
+((1,3) [] [] [] [(1,2)] GGTGTA) (null)
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/rf_bubble.txt.svg b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/rf_bubble.txt.svg
new file mode 100644
index 0000000..80a9d65
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/rf_bubble.txt.svg
@@ -0,0 +1,193 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
+ "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<!-- Generated by graphviz version 2.26.3 (20100126.1600)
+ -->
+<!-- Title: rf_bubble_txt Pages: 1 -->
+<svg width="394pt" height="428pt"
+ viewBox="0.00 0.00 394.00 428.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+<g id="graph1" class="graph" transform="scale(1 1) rotate(0) translate(4 424)">
+<title>rf_bubble_txt</title>
+<polygon fill="white" stroke="white" points="-4,5 -4,-424 391,-424 391,5 -4,5"/>
+<g id="graph2" class="cluster"><title>cluster_legend</title>
+<polygon fill="none" stroke="black" points="49,-8 49,-209 211,-209 211,-8 49,-8"/>
+<text text-anchor="middle" x="130" y="-192.4" font-family="Times Roman,serif" font-size="14.00">legend</text>
+</g>
+<g id="graph3" class="cluster"><title>cluster_1</title>
+<polygon fill="none" stroke="black" points="8,-324 8,-412 377,-412 377,-324 8,-324"/>
+</g>
+<g id="graph4" class="cluster"><title>cluster_2</title>
+<polygon fill="none" stroke="black" points="8,-217 8,-305 378,-305 378,-217 8,-217"/>
+</g>
+<!-- legend_0_0 -->
+<g id="node2" class="node"><title>legend_0_0</title>
+<ellipse fill="black" stroke="black" cx="59" cy="-157" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_1_0 -->
+<g id="node3" class="node"><title>legend_1_0</title>
+<ellipse fill="black" stroke="black" cx="201" cy="-157" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_0_0->legend_1_0 -->
+<g id="edge3" class="edge"><title>legend_0_0->legend_1_0</title>
+<path fill="none" stroke="#dd1e2f" d="M61.0074,-157C74.8673,-157 156.744,-157 188.46,-157"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="188.862,-160.5 198.862,-157 188.861,-153.5 188.862,-160.5"/>
+<text text-anchor="middle" x="130" y="-162.4" font-family="Times Roman,serif" font-size="14.00">FF</text>
+</g>
+<!-- legend_0_1 -->
+<g id="node5" class="node"><title>legend_0_1</title>
+<ellipse fill="black" stroke="black" cx="59" cy="-116" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_1_1 -->
+<g id="node6" class="node"><title>legend_1_1</title>
+<ellipse fill="black" stroke="black" cx="201" cy="-116" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_0_1->legend_1_1 -->
+<g id="edge5" class="edge"><title>legend_0_1->legend_1_1</title>
+<path fill="none" stroke="#ebb035" d="M61.0074,-116C74.8673,-116 156.744,-116 188.46,-116"/>
+<polygon fill="#ebb035" stroke="#ebb035" points="188.862,-119.5 198.862,-116 188.861,-112.5 188.862,-119.5"/>
+<text text-anchor="middle" x="130" y="-121.4" font-family="Times Roman,serif" font-size="14.00">FR</text>
+</g>
+<!-- legend_0_2 -->
+<g id="node8" class="node"><title>legend_0_2</title>
+<ellipse fill="black" stroke="black" cx="59" cy="-75" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_1_2 -->
+<g id="node9" class="node"><title>legend_1_2</title>
+<ellipse fill="black" stroke="black" cx="201" cy="-75" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_0_2->legend_1_2 -->
+<g id="edge7" class="edge"><title>legend_0_2->legend_1_2</title>
+<path fill="none" stroke="#06a2cb" d="M61.0074,-75C74.8673,-75 156.744,-75 188.46,-75"/>
+<polygon fill="#06a2cb" stroke="#06a2cb" points="188.862,-78.5001 198.862,-75 188.861,-71.5001 188.862,-78.5001"/>
+<text text-anchor="middle" x="130" y="-80.4" font-family="Times Roman,serif" font-size="14.00">RF</text>
+</g>
+<!-- legend_0_3 -->
+<g id="node11" class="node"><title>legend_0_3</title>
+<ellipse fill="black" stroke="black" cx="59" cy="-34" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_1_3 -->
+<g id="node12" class="node"><title>legend_1_3</title>
+<ellipse fill="black" stroke="black" cx="201" cy="-34" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_0_3->legend_1_3 -->
+<g id="edge9" class="edge"><title>legend_0_3->legend_1_3</title>
+<path fill="none" stroke="#218559" d="M61.0074,-34C74.8673,-34 156.744,-34 188.46,-34"/>
+<polygon fill="#218559" stroke="#218559" points="188.862,-37.5001 198.862,-34 188.861,-30.5001 188.862,-37.5001"/>
+<text text-anchor="middle" x="130" y="-39.4" font-family="Times Roman,serif" font-size="14.00">RR</text>
+</g>
+<!-- 1,1 -->
+<g id="node15" class="node"><title>1,1</title>
+<ellipse fill="none" stroke="black" cx="59" cy="-368" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="39.5" y="-379.167" font-family="Times Roman,serif" font-size="10.00">1,1--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="37,-360 37,-374 82,-374 82,-360 37,-360"/>
+<text text-anchor="start" x="42.5" y="-364.667" font-family="Times Roman,serif" font-size="10.00">ACGGT</text>
+<polygon fill="#218559" stroke="#218559" points="37,-346 37,-360 82,-360 82,-346 37,-346"/>
+<text text-anchor="start" x="43" y="-350.667" font-family="Times Roman,serif" font-size="10.00">ACCGT</text>
+</g>
+<!-- 1,2 -->
+<g id="node16" class="node"><title>1,2</title>
+<ellipse fill="none" stroke="black" cx="201" cy="-368" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="181.5" y="-379.167" font-family="Times Roman,serif" font-size="10.00">1,2--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="179,-360 179,-374 224,-374 224,-360 179,-360"/>
+<text text-anchor="start" x="184" y="-364.667" font-family="Times Roman,serif" font-size="10.00">CGGTG</text>
+<polygon fill="#218559" stroke="#218559" points="179,-346 179,-360 224,-360 224,-346 179,-346"/>
+<text text-anchor="start" x="184" y="-350.667" font-family="Times Roman,serif" font-size="10.00">CACCG</text>
+</g>
+<!-- 1,1->1,2 -->
+<g id="edge25" class="edge"><title>1,1->1,2</title>
+<path fill="none" stroke="#dd1e2f" d="M101.605,-361.755C116.207,-361.208 132.729,-361.105 148.049,-361.448"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="148.326,-364.957 158.425,-361.756 148.534,-357.96 148.326,-364.957"/>
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+<!-- 2,2 -->
+<g id="node20" class="node"><title>2,2</title>
+<ellipse fill="none" stroke="black" cx="201" cy="-261" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="181.5" y="-272.167" font-family="Times Roman,serif" font-size="10.00">2,2--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="179,-253 179,-267 224,-267 224,-253 179,-253"/>
+<text text-anchor="start" x="184.5" y="-257.667" font-family="Times Roman,serif" font-size="10.00">CCGTG</text>
+<polygon fill="#218559" stroke="#218559" points="179,-239 179,-253 224,-253 224,-239 179,-239"/>
+<text text-anchor="start" x="183.5" y="-243.667" font-family="Times Roman,serif" font-size="10.00">CACGG</text>
+</g>
+<!-- 1,1->2,2 -->
+<g id="edge27" class="edge"><title>1,1->2,2</title>
+<path fill="none" stroke="#06a2cb" d="M96.6544,-349.87C117.807,-339.685 140,-329 140,-329 140,-329 153.666,-313.765 168.062,-297.718"/>
+<polygon fill="#06a2cb" stroke="#06a2cb" points="171.058,-299.619 175.131,-289.838 165.848,-294.945 171.058,-299.619"/>
+</g>
+<!-- 1,2->1,1 -->
+<g id="edge33" class="edge"><title>1,2->1,1</title>
+<path fill="none" stroke="#218559" d="M158.425,-374.244C143.825,-374.792 127.305,-374.895 111.982,-374.553"/>
+<polygon fill="#218559" stroke="#218559" points="111.704,-371.043 101.605,-374.245 111.497,-378.04 111.704,-371.043"/>
+</g>
+<!-- 1,3 -->
+<g id="node17" class="node"><title>1,3</title>
+<ellipse fill="none" stroke="black" cx="326" cy="-368" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="306.5" y="-379.167" font-family="Times Roman,serif" font-size="10.00">1,3--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="304,-360 304,-374 349,-374 349,-360 304,-360"/>
+<text text-anchor="start" x="307" y="-364.667" font-family="Times Roman,serif" font-size="10.00">GGTGTA</text>
+<polygon fill="#218559" stroke="#218559" points="304,-346 304,-360 349,-360 349,-346 304,-346"/>
+<text text-anchor="start" x="307.5" y="-350.667" font-family="Times Roman,serif" font-size="10.00">TACACC</text>
+</g>
+<!-- 1,2->1,3 -->
+<g id="edge29" class="edge"><title>1,2->1,3</title>
+<path fill="none" stroke="#dd1e2f" d="M243.319,-361.573C252.886,-361.256 263.16,-361.173 273.102,-361.321"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="273.22,-364.825 283.299,-361.561 273.384,-357.827 273.22,-364.825"/>
+</g>
+<!-- 2,1 -->
+<g id="node19" class="node"><title>2,1</title>
+<ellipse fill="none" stroke="black" cx="59" cy="-261" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="39.5" y="-272.167" font-family="Times Roman,serif" font-size="10.00">2,1--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="37,-253 37,-267 82,-267 82,-253 37,-253"/>
+<text text-anchor="start" x="43" y="-257.667" font-family="Times Roman,serif" font-size="10.00">ACCGT</text>
+<polygon fill="#218559" stroke="#218559" points="37,-239 37,-253 82,-253 82,-239 37,-239"/>
+<text text-anchor="start" x="42.5" y="-243.667" font-family="Times Roman,serif" font-size="10.00">ACGGT</text>
+</g>
+<!-- 1,2->2,1 -->
+<g id="edge31" class="edge"><title>1,2->2,1</title>
+<path fill="none" stroke="#06a2cb" d="M167.587,-345.312C145.274,-330.161 120,-313 120,-313 120,-313 109.378,-303.945 96.9983,-293.392"/>
+<polygon fill="#06a2cb" stroke="#06a2cb" points="99.0233,-290.519 89.1426,-286.695 94.4822,-295.846 99.0233,-290.519"/>
+</g>
+<!-- 1,3->1,2 -->
+<g id="edge35" class="edge"><title>1,3->1,2</title>
+<path fill="none" stroke="#218559" d="M283.299,-374.439C273.713,-374.75 263.434,-374.828 253.502,-374.673"/>
+<polygon fill="#218559" stroke="#218559" points="253.401,-371.169 243.319,-374.427 253.232,-378.167 253.401,-371.169"/>
+</g>
+<!-- 2,1->1,2 -->
+<g id="edge15" class="edge"><title>2,1->1,2</title>
+<path fill="none" stroke="#06a2cb" d="M92.4134,-283.688C114.726,-298.839 140,-316 140,-316 140,-316 150.622,-325.055 163.002,-335.608"/>
+<polygon fill="#06a2cb" stroke="#06a2cb" points="160.977,-338.481 170.857,-342.305 165.518,-333.154 160.977,-338.481"/>
+</g>
+<!-- 2,1->2,2 -->
+<g id="edge13" class="edge"><title>2,1->2,2</title>
+<path fill="none" stroke="#dd1e2f" d="M101.605,-254.755C116.207,-254.208 132.729,-254.105 148.049,-254.448"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="148.326,-257.957 158.425,-254.756 148.534,-250.96 148.326,-257.957"/>
+</g>
+<!-- 2,2->1,1 -->
+<g id="edge19" class="edge"><title>2,2->1,1</title>
+<path fill="none" stroke="#06a2cb" d="M168.906,-285.184C148.325,-300.692 121.435,-320.954 99.4042,-337.555"/>
+<polygon fill="#06a2cb" stroke="#06a2cb" points="97.1022,-334.907 91.222,-343.72 101.315,-340.497 97.1022,-334.907"/>
+</g>
+<!-- 2,2->2,1 -->
+<g id="edge21" class="edge"><title>2,2->2,1</title>
+<path fill="none" stroke="#218559" d="M158.425,-267.244C143.825,-267.792 127.305,-267.895 111.982,-267.553"/>
+<polygon fill="#218559" stroke="#218559" points="111.704,-264.043 101.605,-267.245 111.497,-271.04 111.704,-264.043"/>
+</g>
+<!-- 2,3 -->
+<g id="node21" class="node"><title>2,3</title>
+<ellipse fill="none" stroke="black" cx="326" cy="-261" rx="43.8406" ry="36.0624"/>
+<text text-anchor="start" x="306" y="-272.167" font-family="Times Roman,serif" font-size="10.00">2,3--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="303,-253 303,-267 349,-267 349,-253 303,-253"/>
+<text text-anchor="start" x="306" y="-257.667" font-family="Times Roman,serif" font-size="10.00">CGTGGT</text>
+<polygon fill="#218559" stroke="#218559" points="303,-239 303,-253 349,-253 349,-239 303,-239"/>
+<text text-anchor="start" x="305.5" y="-243.667" font-family="Times Roman,serif" font-size="10.00">ACCACG</text>
+</g>
+<!-- 2,2->2,3 -->
+<g id="edge17" class="edge"><title>2,2->2,3</title>
+<path fill="none" stroke="#dd1e2f" d="M243.319,-254.573C252.676,-254.263 262.709,-254.176 272.446,-254.312"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="272.37,-257.811 282.446,-254.534 272.526,-250.813 272.37,-257.811"/>
+</g>
+<!-- 2,3->2,2 -->
+<g id="edge23" class="edge"><title>2,3->2,2</title>
+<path fill="none" stroke="#218559" d="M282.446,-267.466C273.13,-267.753 263.195,-267.823 253.581,-267.674"/>
+<polygon fill="#218559" stroke="#218559" points="253.401,-264.169 243.319,-267.427 253.232,-271.167 253.401,-264.169"/>
+</g>
+</g>
+</svg>
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/rf_bubble/.part-0.crc b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/rf_bubble/.part-0.crc
new file mode 100644
index 0000000..e87ee4f
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/rf_bubble/.part-0.crc
Binary files differ
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/rf_bubble/.part-1.crc b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/rf_bubble/.part-1.crc
new file mode 100644
index 0000000..2c9bb22
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/rf_bubble/.part-1.crc
Binary files differ
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/rf_bubble/part-0 b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/rf_bubble/part-0
new file mode 100755
index 0000000..4388d34
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/rf_bubble/part-0
Binary files differ
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/rf_bubble/part-1 b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/rf_bubble/part-1
new file mode 100755
index 0000000..fbd0d87
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/rf_bubble/part-1
Binary files differ
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/small_bubble.txt b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/small_bubble.txt
new file mode 100644
index 0000000..14cf2e1
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/small_bubble.txt
@@ -0,0 +1,6 @@
+((2,1) [(2,2)] [] [] [(1,3)] AGAAG) (null)
+((2,2) [(2,3)] [] [] [(1,4),(2,1)] GAAGC) (null)
+((2,3) [] [] [] [(2,2)] AAGCCC) (null)
+((1,1) [(1,3)] [] [] [] AATAGA) (null)
+((1,3) [(2,1),(1,4)] [] [] [(1,1)] TAGAA) (null)
+((1,4) [(2,2)] [] [] [(1,3)] AGAAG) (null)
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/small_bubble.txt.svg b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/small_bubble.txt.svg
new file mode 100644
index 0000000..550660b
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/small_bubble.txt.svg
@@ -0,0 +1,193 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
+ "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<!-- Generated by graphviz version 2.26.3 (20100126.1600)
+ -->
+<!-- Title: small_bubble_txt Pages: 1 -->
+<svg width="644pt" height="321pt"
+ viewBox="0.00 0.00 644.00 321.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+<g id="graph1" class="graph" transform="scale(1 1) rotate(0) translate(4 317)">
+<title>small_bubble_txt</title>
+<polygon fill="white" stroke="white" points="-4,5 -4,-317 641,-317 641,5 -4,5"/>
+<g id="graph2" class="cluster"><title>cluster_legend</title>
+<polygon fill="none" stroke="black" points="49,-8 49,-209 211,-209 211,-8 49,-8"/>
+<text text-anchor="middle" x="130" y="-192.4" font-family="Times Roman,serif" font-size="14.00">legend</text>
+</g>
+<g id="graph3" class="cluster"><title>cluster_1</title>
+<polygon fill="none" stroke="black" points="8,-217 8,-305 376,-305 376,-217 8,-217"/>
+</g>
+<g id="graph4" class="cluster"><title>cluster_2</title>
+<polygon fill="none" stroke="black" points="274,-121 274,-209 628,-209 628,-121 274,-121"/>
+</g>
+<!-- legend_0_0 -->
+<g id="node2" class="node"><title>legend_0_0</title>
+<ellipse fill="black" stroke="black" cx="59" cy="-157" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_1_0 -->
+<g id="node3" class="node"><title>legend_1_0</title>
+<ellipse fill="black" stroke="black" cx="201" cy="-157" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_0_0->legend_1_0 -->
+<g id="edge3" class="edge"><title>legend_0_0->legend_1_0</title>
+<path fill="none" stroke="#dd1e2f" d="M61.0074,-157C74.8673,-157 156.744,-157 188.46,-157"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="188.862,-160.5 198.862,-157 188.861,-153.5 188.862,-160.5"/>
+<text text-anchor="middle" x="130" y="-162.4" font-family="Times Roman,serif" font-size="14.00">FF</text>
+</g>
+<!-- legend_0_1 -->
+<g id="node5" class="node"><title>legend_0_1</title>
+<ellipse fill="black" stroke="black" cx="59" cy="-116" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_1_1 -->
+<g id="node6" class="node"><title>legend_1_1</title>
+<ellipse fill="black" stroke="black" cx="201" cy="-116" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_0_1->legend_1_1 -->
+<g id="edge5" class="edge"><title>legend_0_1->legend_1_1</title>
+<path fill="none" stroke="#ebb035" d="M61.0074,-116C74.8673,-116 156.744,-116 188.46,-116"/>
+<polygon fill="#ebb035" stroke="#ebb035" points="188.862,-119.5 198.862,-116 188.861,-112.5 188.862,-119.5"/>
+<text text-anchor="middle" x="130" y="-121.4" font-family="Times Roman,serif" font-size="14.00">FR</text>
+</g>
+<!-- legend_0_2 -->
+<g id="node8" class="node"><title>legend_0_2</title>
+<ellipse fill="black" stroke="black" cx="59" cy="-75" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_1_2 -->
+<g id="node9" class="node"><title>legend_1_2</title>
+<ellipse fill="black" stroke="black" cx="201" cy="-75" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_0_2->legend_1_2 -->
+<g id="edge7" class="edge"><title>legend_0_2->legend_1_2</title>
+<path fill="none" stroke="#06a2cb" d="M61.0074,-75C74.8673,-75 156.744,-75 188.46,-75"/>
+<polygon fill="#06a2cb" stroke="#06a2cb" points="188.862,-78.5001 198.862,-75 188.861,-71.5001 188.862,-78.5001"/>
+<text text-anchor="middle" x="130" y="-80.4" font-family="Times Roman,serif" font-size="14.00">RF</text>
+</g>
+<!-- legend_0_3 -->
+<g id="node11" class="node"><title>legend_0_3</title>
+<ellipse fill="black" stroke="black" cx="59" cy="-34" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_1_3 -->
+<g id="node12" class="node"><title>legend_1_3</title>
+<ellipse fill="black" stroke="black" cx="201" cy="-34" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_0_3->legend_1_3 -->
+<g id="edge9" class="edge"><title>legend_0_3->legend_1_3</title>
+<path fill="none" stroke="#218559" d="M61.0074,-34C74.8673,-34 156.744,-34 188.46,-34"/>
+<polygon fill="#218559" stroke="#218559" points="188.862,-37.5001 198.862,-34 188.861,-30.5001 188.862,-37.5001"/>
+<text text-anchor="middle" x="130" y="-39.4" font-family="Times Roman,serif" font-size="14.00">RR</text>
+</g>
+<!-- 1,1 -->
+<g id="node15" class="node"><title>1,1</title>
+<ellipse fill="none" stroke="black" cx="59" cy="-261" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="39.5" y="-272.167" font-family="Times Roman,serif" font-size="10.00">1,1--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="37,-253 37,-267 82,-267 82,-253 37,-253"/>
+<text text-anchor="start" x="40" y="-257.667" font-family="Times Roman,serif" font-size="10.00">AATAGA</text>
+<polygon fill="#218559" stroke="#218559" points="37,-239 37,-253 82,-253 82,-239 37,-239"/>
+<text text-anchor="start" x="43" y="-243.667" font-family="Times Roman,serif" font-size="10.00">TCTATT</text>
+</g>
+<!-- 1,3 -->
+<g id="node16" class="node"><title>1,3</title>
+<ellipse fill="none" stroke="black" cx="201" cy="-261" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="181.5" y="-272.167" font-family="Times Roman,serif" font-size="10.00">1,3--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="179,-253 179,-267 224,-267 224,-253 179,-253"/>
+<text text-anchor="start" x="185" y="-257.667" font-family="Times Roman,serif" font-size="10.00">TAGAA</text>
+<polygon fill="#218559" stroke="#218559" points="179,-239 179,-253 224,-253 224,-239 179,-239"/>
+<text text-anchor="start" x="187.5" y="-243.667" font-family="Times Roman,serif" font-size="10.00">TTCTA</text>
+</g>
+<!-- 1,1->1,3 -->
+<g id="edge25" class="edge"><title>1,1->1,3</title>
+<path fill="none" stroke="#dd1e2f" d="M101.605,-254.755C116.207,-254.208 132.729,-254.105 148.049,-254.448"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="148.326,-257.957 158.425,-254.756 148.534,-250.96 148.326,-257.957"/>
+</g>
+<!-- 1,3->1,1 -->
+<g id="edge31" class="edge"><title>1,3->1,1</title>
+<path fill="none" stroke="#218559" d="M158.425,-267.244C143.825,-267.792 127.305,-267.895 111.982,-267.553"/>
+<polygon fill="#218559" stroke="#218559" points="111.704,-264.043 101.605,-267.245 111.497,-271.04 111.704,-264.043"/>
+</g>
+<!-- 1,4 -->
+<g id="node17" class="node"><title>1,4</title>
+<ellipse fill="none" stroke="black" cx="325" cy="-261" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="305.5" y="-272.167" font-family="Times Roman,serif" font-size="10.00">1,4--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="303,-253 303,-267 348,-267 348,-253 303,-253"/>
+<text text-anchor="start" x="307.5" y="-257.667" font-family="Times Roman,serif" font-size="10.00">AGAAG</text>
+<polygon fill="#218559" stroke="#218559" points="303,-239 303,-253 348,-253 348,-239 303,-239"/>
+<text text-anchor="start" x="311" y="-243.667" font-family="Times Roman,serif" font-size="10.00">CTTCT</text>
+</g>
+<!-- 1,3->1,4 -->
+<g id="edge29" class="edge"><title>1,3->1,4</title>
+<path fill="none" stroke="#dd1e2f" d="M243.327,-254.562C252.601,-254.258 262.531,-254.176 272.159,-254.316"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="272.364,-257.822 282.443,-254.554 272.527,-250.823 272.364,-257.822"/>
+</g>
+<!-- 2,1 -->
+<g id="node19" class="node"><title>2,1</title>
+<ellipse fill="none" stroke="black" cx="325" cy="-165" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="305.5" y="-176.167" font-family="Times Roman,serif" font-size="10.00">2,1--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="303,-157 303,-171 348,-171 348,-157 303,-157"/>
+<text text-anchor="start" x="307.5" y="-161.667" font-family="Times Roman,serif" font-size="10.00">AGAAG</text>
+<polygon fill="#218559" stroke="#218559" points="303,-143 303,-157 348,-157 348,-143 303,-143"/>
+<text text-anchor="start" x="311" y="-147.667" font-family="Times Roman,serif" font-size="10.00">CTTCT</text>
+</g>
+<!-- 1,3->2,1 -->
+<g id="edge27" class="edge"><title>1,3->2,1</title>
+<path fill="none" stroke="#dd1e2f" d="M234.345,-237.712C249.456,-227.157 264,-217 264,-217 264,-217 274.622,-207.945 287.002,-197.392"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="289.518,-199.846 294.857,-190.695 284.977,-194.519 289.518,-199.846"/>
+</g>
+<!-- 1,4->1,3 -->
+<g id="edge35" class="edge"><title>1,4->1,3</title>
+<path fill="none" stroke="#218559" d="M282.443,-267.446C273.158,-267.745 263.225,-267.824 253.602,-267.681"/>
+<polygon fill="#218559" stroke="#218559" points="253.407,-264.175 243.327,-267.438 253.242,-271.173 253.407,-264.175"/>
+</g>
+<!-- 2,2 -->
+<g id="node20" class="node"><title>2,2</title>
+<ellipse fill="none" stroke="black" cx="449" cy="-165" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="429.5" y="-176.167" font-family="Times Roman,serif" font-size="10.00">2,2--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="427,-157 427,-171 472,-171 472,-157 427,-157"/>
+<text text-anchor="start" x="431.5" y="-161.667" font-family="Times Roman,serif" font-size="10.00">GAAGC</text>
+<polygon fill="#218559" stroke="#218559" points="427,-143 427,-157 472,-157 472,-143 427,-143"/>
+<text text-anchor="start" x="434" y="-147.667" font-family="Times Roman,serif" font-size="10.00">GCTTC</text>
+</g>
+<!-- 1,4->2,2 -->
+<g id="edge33" class="edge"><title>1,4->2,2</title>
+<path fill="none" stroke="#dd1e2f" d="M361.282,-241.419C375.287,-233.861 388,-227 388,-227 388,-227 400.484,-214.311 414.157,-200.414"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="416.837,-202.681 421.356,-193.098 411.847,-197.771 416.837,-202.681"/>
+</g>
+<!-- 2,1->1,3 -->
+<g id="edge15" class="edge"><title>2,1->1,3</title>
+<path fill="none" stroke="#218559" d="M293.015,-189.762C277.051,-202.122 257.587,-217.19 240.68,-230.28"/>
+<polygon fill="#218559" stroke="#218559" points="238.376,-227.637 232.611,-236.527 242.661,-233.173 238.376,-227.637"/>
+</g>
+<!-- 2,1->2,2 -->
+<g id="edge13" class="edge"><title>2,1->2,2</title>
+<path fill="none" stroke="#dd1e2f" d="M367.327,-158.562C376.601,-158.258 386.531,-158.176 396.159,-158.316"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="396.364,-161.822 406.443,-158.554 396.527,-154.823 396.364,-161.822"/>
+</g>
+<!-- 2,2->1,4 -->
+<g id="edge19" class="edge"><title>2,2->1,4</title>
+<path fill="none" stroke="#218559" d="M417.015,-189.762C401.051,-202.122 381.587,-217.19 364.68,-230.28"/>
+<polygon fill="#218559" stroke="#218559" points="362.376,-227.637 356.611,-236.527 366.661,-233.173 362.376,-227.637"/>
+</g>
+<!-- 2,2->2,1 -->
+<g id="edge21" class="edge"><title>2,2->2,1</title>
+<path fill="none" stroke="#218559" d="M406.443,-171.446C397.158,-171.745 387.225,-171.824 377.602,-171.681"/>
+<polygon fill="#218559" stroke="#218559" points="377.407,-168.175 367.327,-171.438 377.242,-175.173 377.407,-168.175"/>
+</g>
+<!-- 2,3 -->
+<g id="node21" class="node"><title>2,3</title>
+<ellipse fill="none" stroke="black" cx="575" cy="-165" rx="44.0472" ry="36.0624"/>
+<text text-anchor="start" x="555.5" y="-176.167" font-family="Times Roman,serif" font-size="10.00">2,3--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="552,-157 552,-171 599,-171 599,-157 552,-157"/>
+<text text-anchor="start" x="554.5" y="-161.667" font-family="Times Roman,serif" font-size="10.00">AAGCCC</text>
+<polygon fill="#218559" stroke="#218559" points="552,-143 552,-157 599,-157 599,-143 552,-143"/>
+<text text-anchor="start" x="555.5" y="-147.667" font-family="Times Roman,serif" font-size="10.00">GGGCTT</text>
+</g>
+<!-- 2,2->2,3 -->
+<g id="edge17" class="edge"><title>2,2->2,3</title>
+<path fill="none" stroke="#dd1e2f" d="M491.658,-158.573C501.09,-158.263 511.203,-158.176 521.018,-158.312"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="521.023,-161.813 531.097,-158.534 521.177,-154.814 521.023,-161.813"/>
+</g>
+<!-- 2,3->2,2 -->
+<g id="edge23" class="edge"><title>2,3->2,2</title>
+<path fill="none" stroke="#218559" d="M531.097,-171.466C521.607,-171.756 511.479,-171.824 501.692,-171.669"/>
+<polygon fill="#218559" stroke="#218559" points="501.739,-168.169 491.658,-171.427 501.571,-175.167 501.739,-168.169"/>
+</g>
+</g>
+</svg>
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/small_bubble/.part-0.crc b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/small_bubble/.part-0.crc
new file mode 100644
index 0000000..fc426bc
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/small_bubble/.part-0.crc
Binary files differ
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/small_bubble/.part-1.crc b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/small_bubble/.part-1.crc
new file mode 100644
index 0000000..611cf9d
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/small_bubble/.part-1.crc
Binary files differ
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/small_bubble/part-0 b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/small_bubble/part-0
new file mode 100755
index 0000000..de5dd64
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/small_bubble/part-0
Binary files differ
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/small_bubble/part-1 b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/small_bubble/part-1
new file mode 100755
index 0000000..d84c1d2
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/small_bubble/part-1
Binary files differ
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/tip_and_bubble.txt b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/tip_and_bubble.txt
new file mode 100644
index 0000000..5fde720
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/tip_and_bubble.txt
@@ -0,0 +1,9 @@
+((2,1) [(3,1),(2,2)] [] [] [(1,1)] ATAGA) (null)
+((2,2) [(2,3)] [] [] [(2,1)] TAGAC) (null)
+((2,3) [(2,4)] [] [] [(2,2)] AGACT) (null)
+((2,4) [(3,4)] [] [] [(2,3)] GACTA) (null)
+((1,1) [(2,1),(1,2)] [] [] [] AATAG) (null)
+((1,2) [] [] [] [(1,1)] ATAGAAG) (null)
+((3,1) [(3,3)] [] [] [(2,1)] TAGACT) (null)
+((3,3) [(3,4)] [] [] [(3,1)] GACTA) (null)
+((3,4) [] [] [] [(2,4),(3,3)] ACTAC) (null)
diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/tip_and_bubble.txt.svg b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/tip_and_bubble.txt.svg
new file mode 100644
index 0000000..1ae4c53
--- /dev/null
+++ b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/tip_and_bubble.txt.svg
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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
+ "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
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+<!-- Title: tip_and_bubble_txt Pages: 1 -->
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+ viewBox="0.00 0.00 650.00 417.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+<g id="graph1" class="graph" transform="scale(1 1) rotate(0) translate(4 413)">
+<title>tip_and_bubble_txt</title>
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+<g id="graph2" class="cluster"><title>cluster_legend</title>
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+<text text-anchor="middle" x="132.5" y="-192.4" font-family="Times Roman,serif" font-size="14.00">legend</text>
+</g>
+<g id="graph3" class="cluster"><title>cluster_1</title>
+<polygon fill="none" stroke="black" points="8,-313 8,-401 262,-401 262,-313 8,-313"/>
+</g>
+<g id="graph4" class="cluster"><title>cluster_3</title>
+<polygon fill="none" stroke="black" points="284,-109 284,-197 634,-197 634,-109 284,-109"/>
+</g>
+<g id="graph5" class="cluster"><title>cluster_2</title>
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+</g>
+<!-- legend_0_0 -->
+<g id="node2" class="node"><title>legend_0_0</title>
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+</g>
+<!-- legend_1_0 -->
+<g id="node3" class="node"><title>legend_1_0</title>
+<ellipse fill="black" stroke="black" cx="206" cy="-157" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_0_0->legend_1_0 -->
+<g id="edge3" class="edge"><title>legend_0_0->legend_1_0</title>
+<path fill="none" stroke="#dd1e2f" d="M61.078,-157C75.5476,-157 161.628,-157 193.842,-157"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="194.198,-160.5 204.198,-157 194.198,-153.5 194.198,-160.5"/>
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+</g>
+<!-- legend_0_1 -->
+<g id="node5" class="node"><title>legend_0_1</title>
+<ellipse fill="black" stroke="black" cx="59" cy="-116" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_1_1 -->
+<g id="node6" class="node"><title>legend_1_1</title>
+<ellipse fill="black" stroke="black" cx="206" cy="-116" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_0_1->legend_1_1 -->
+<g id="edge5" class="edge"><title>legend_0_1->legend_1_1</title>
+<path fill="none" stroke="#ebb035" d="M61.078,-116C75.5476,-116 161.628,-116 193.842,-116"/>
+<polygon fill="#ebb035" stroke="#ebb035" points="194.198,-119.5 204.198,-116 194.198,-112.5 194.198,-119.5"/>
+<text text-anchor="middle" x="130" y="-121.4" font-family="Times Roman,serif" font-size="14.00">FR</text>
+</g>
+<!-- legend_0_2 -->
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+<ellipse fill="black" stroke="black" cx="59" cy="-75" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_1_2 -->
+<g id="node9" class="node"><title>legend_1_2</title>
+<ellipse fill="black" stroke="black" cx="206" cy="-75" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_0_2->legend_1_2 -->
+<g id="edge7" class="edge"><title>legend_0_2->legend_1_2</title>
+<path fill="none" stroke="#06a2cb" d="M61.078,-75C75.5476,-75 161.628,-75 193.842,-75"/>
+<polygon fill="#06a2cb" stroke="#06a2cb" points="194.198,-78.5001 204.198,-75 194.198,-71.5001 194.198,-78.5001"/>
+<text text-anchor="middle" x="130" y="-80.4" font-family="Times Roman,serif" font-size="14.00">RF</text>
+</g>
+<!-- legend_0_3 -->
+<g id="node11" class="node"><title>legend_0_3</title>
+<ellipse fill="black" stroke="black" cx="59" cy="-34" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_1_3 -->
+<g id="node12" class="node"><title>legend_1_3</title>
+<ellipse fill="black" stroke="black" cx="206" cy="-34" rx="1.8" ry="1.8"/>
+</g>
+<!-- legend_0_3->legend_1_3 -->
+<g id="edge9" class="edge"><title>legend_0_3->legend_1_3</title>
+<path fill="none" stroke="#218559" d="M61.078,-34C75.5476,-34 161.628,-34 193.842,-34"/>
+<polygon fill="#218559" stroke="#218559" points="194.198,-37.5001 204.198,-34 194.198,-30.5001 194.198,-37.5001"/>
+<text text-anchor="middle" x="130" y="-39.4" font-family="Times Roman,serif" font-size="14.00">RR</text>
+</g>
+<!-- 1,1 -->
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+<text text-anchor="start" x="43.5" y="-353.667" font-family="Times Roman,serif" font-size="10.00">AATAG</text>
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+<text text-anchor="start" x="45.5" y="-339.667" font-family="Times Roman,serif" font-size="10.00">CTATT</text>
+</g>
+<!-- 1,2 -->
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+<text text-anchor="start" x="186.5" y="-368.167" font-family="Times Roman,serif" font-size="10.00">1,2--null</text>
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+<text text-anchor="start" x="183.5" y="-353.667" font-family="Times Roman,serif" font-size="10.00">ATAGAAG</text>
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+<text text-anchor="start" x="187" y="-339.667" font-family="Times Roman,serif" font-size="10.00">CTTCTAT</text>
+</g>
+<!-- 1,1->1,2 -->
+<g id="edge34" class="edge"><title>1,1->1,2</title>
+<path fill="none" stroke="#dd1e2f" d="M101.518,-350.814C116.334,-350.242 133.206,-350.105 149.005,-350.404"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="149.114,-353.907 159.199,-350.663 149.292,-346.91 149.114,-353.907"/>
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+<!-- 2,1 -->
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+<text text-anchor="start" x="186.5" y="-272.167" font-family="Times Roman,serif" font-size="10.00">2,1--null</text>
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+<text text-anchor="start" x="192.5" y="-243.667" font-family="Times Roman,serif" font-size="10.00">TCTAT</text>
+</g>
+<!-- 1,1->2,1 -->
+<g id="edge32" class="edge"><title>1,1->2,1</title>
+<path fill="none" stroke="#dd1e2f" d="M95.2356,-337.316C116.802,-325.601 140,-313 140,-313 140,-313 152.492,-303.158 166.607,-292.037"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="168.857,-294.72 174.546,-285.782 164.525,-289.221 168.857,-294.72"/>
+</g>
+<!-- 1,2->1,1 -->
+<g id="edge36" class="edge"><title>1,2->1,1</title>
+<path fill="none" stroke="#218559" d="M159.199,-363.337C144.021,-363.827 127.084,-363.881 111.518,-363.499"/>
+<polygon fill="#218559" stroke="#218559" points="111.623,-360.001 101.518,-363.186 111.404,-366.998 111.623,-360.001"/>
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+<!-- 3,1 -->
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+<ellipse fill="none" stroke="black" cx="335" cy="-153" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="315.5" y="-164.167" font-family="Times Roman,serif" font-size="10.00">3,1--null</text>
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+<text text-anchor="start" x="317" y="-135.667" font-family="Times Roman,serif" font-size="10.00">AGTCTA</text>
+</g>
+<!-- 3,3 -->
+<g id="node19" class="node"><title>3,3</title>
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+<text text-anchor="start" x="439.5" y="-164.167" font-family="Times Roman,serif" font-size="10.00">3,3--null</text>
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+<text text-anchor="start" x="444.5" y="-135.667" font-family="Times Roman,serif" font-size="10.00">TAGTC</text>
+</g>
+<!-- 3,1->3,3 -->
+<g id="edge38" class="edge"><title>3,1->3,3</title>
+<path fill="none" stroke="#dd1e2f" d="M377.327,-146.562C386.601,-146.258 396.531,-146.176 406.159,-146.316"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="406.364,-149.822 416.443,-146.554 406.527,-142.823 406.364,-149.822"/>
+</g>
+<!-- 3,1->2,1 -->
+<g id="edge40" class="edge"><title>3,1->2,1</title>
+<path fill="none" stroke="#218559" d="M307.356,-180.644C291.216,-196.784 274,-214 274,-214 274,-214 261.746,-222.469 247.643,-232.218"/>
+<polygon fill="#218559" stroke="#218559" points="245.439,-229.486 239.203,-238.051 249.42,-235.244 245.439,-229.486"/>
+</g>
+<!-- 3,3->3,1 -->
+<g id="edge44" class="edge"><title>3,3->3,1</title>
+<path fill="none" stroke="#218559" d="M416.443,-159.446C407.158,-159.745 397.225,-159.824 387.602,-159.681"/>
+<polygon fill="#218559" stroke="#218559" points="387.407,-156.175 377.327,-159.438 387.242,-163.173 387.407,-156.175"/>
+</g>
+<!-- 3,4 -->
+<g id="node20" class="node"><title>3,4</title>
+<ellipse fill="none" stroke="black" cx="583" cy="-153" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="563.5" y="-164.167" font-family="Times Roman,serif" font-size="10.00">3,4--null</text>
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+<text text-anchor="start" x="567.5" y="-149.667" font-family="Times Roman,serif" font-size="10.00">ACTAC</text>
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+<text text-anchor="start" x="568" y="-135.667" font-family="Times Roman,serif" font-size="10.00">GTAGT</text>
+</g>
+<!-- 3,3->3,4 -->
+<g id="edge42" class="edge"><title>3,3->3,4</title>
+<path fill="none" stroke="#dd1e2f" d="M501.327,-146.562C510.601,-146.258 520.531,-146.176 530.159,-146.316"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="530.364,-149.822 540.443,-146.554 530.527,-142.823 530.364,-149.822"/>
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+<!-- 3,4->3,3 -->
+<g id="edge48" class="edge"><title>3,4->3,3</title>
+<path fill="none" stroke="#218559" d="M540.443,-159.446C531.158,-159.745 521.225,-159.824 511.602,-159.681"/>
+<polygon fill="#218559" stroke="#218559" points="511.407,-156.175 501.327,-159.438 511.242,-163.173 511.407,-156.175"/>
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+<!-- 2,4 -->
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+<ellipse fill="none" stroke="black" cx="583" cy="-261" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="563.5" y="-272.167" font-family="Times Roman,serif" font-size="10.00">2,4--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="561,-253 561,-267 606,-267 606,-253 561,-253"/>
+<text text-anchor="start" x="567" y="-257.667" font-family="Times Roman,serif" font-size="10.00">GACTA</text>
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+<text text-anchor="start" x="568.5" y="-243.667" font-family="Times Roman,serif" font-size="10.00">TAGTC</text>
+</g>
+<!-- 3,4->2,4 -->
+<g id="edge46" class="edge"><title>3,4->2,4</title>
+<path fill="none" stroke="#218559" d="M583,-188.897C583,-188.965 583,-189 583,-189 583,-189 583,-204.137 583,-214.808"/>
+<polygon fill="#218559" stroke="#218559" points="579.5,-215.103 583,-225.103 586.5,-215.103 579.5,-215.103"/>
+</g>
+<!-- 2,1->1,1 -->
+<g id="edge18" class="edge"><title>2,1->1,1</title>
+<path fill="none" stroke="#218559" d="M171.021,-282.15C147.211,-296.547 120,-313 120,-313 120,-313 111.029,-319.471 99.9682,-327.449"/>
+<polygon fill="#218559" stroke="#218559" points="97.7057,-324.766 91.643,-333.454 101.801,-330.443 97.7057,-324.766"/>
+</g>
+<!-- 2,1->3,1 -->
+<g id="edge14" class="edge"><title>2,1->3,1</title>
+<path fill="none" stroke="#dd1e2f" d="M236.571,-235.406C254.514,-220.384 277.353,-201.262 296.514,-185.221"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="298.78,-187.888 304.201,-178.785 294.287,-182.521 298.78,-187.888"/>
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+<!-- 2,2 -->
+<g id="node23" class="node"><title>2,2</title>
+<ellipse fill="none" stroke="black" cx="335" cy="-261" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="315.5" y="-272.167" font-family="Times Roman,serif" font-size="10.00">2,2--null</text>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="313,-253 313,-267 358,-267 358,-253 313,-253"/>
+<text text-anchor="start" x="319.5" y="-257.667" font-family="Times Roman,serif" font-size="10.00">TAGAC</text>
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+<text text-anchor="start" x="320.5" y="-243.667" font-family="Times Roman,serif" font-size="10.00">GTCTA</text>
+</g>
+<!-- 2,1->2,2 -->
+<g id="edge16" class="edge"><title>2,1->2,2</title>
+<path fill="none" stroke="#dd1e2f" d="M248.597,-254.609C259.385,-254.242 271.101,-254.157 282.322,-254.352"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="282.362,-257.854 292.448,-254.61 282.54,-250.856 282.362,-257.854"/>
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+<!-- 2,2->2,1 -->
+<g id="edge22" class="edge"><title>2,2->2,1</title>
+<path fill="none" stroke="#218559" d="M292.448,-267.39C281.662,-267.757 269.947,-267.843 258.724,-267.649"/>
+<polygon fill="#218559" stroke="#218559" points="258.683,-264.147 248.597,-267.391 258.505,-271.145 258.683,-264.147"/>
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+<!-- 2,3 -->
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+<ellipse fill="none" stroke="black" cx="459" cy="-261" rx="43.1335" ry="36.0624"/>
+<text text-anchor="start" x="439.5" y="-272.167" font-family="Times Roman,serif" font-size="10.00">2,3--null</text>
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+<text text-anchor="start" x="444" y="-243.667" font-family="Times Roman,serif" font-size="10.00">AGTCT</text>
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+<!-- 2,2->2,3 -->
+<g id="edge20" class="edge"><title>2,2->2,3</title>
+<path fill="none" stroke="#dd1e2f" d="M377.327,-254.562C386.601,-254.258 396.531,-254.176 406.159,-254.316"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="406.364,-257.822 416.443,-254.554 406.527,-250.823 406.364,-257.822"/>
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+<!-- 2,3->2,2 -->
+<g id="edge26" class="edge"><title>2,3->2,2</title>
+<path fill="none" stroke="#218559" d="M416.443,-267.446C407.158,-267.745 397.225,-267.824 387.602,-267.681"/>
+<polygon fill="#218559" stroke="#218559" points="387.407,-264.175 377.327,-267.438 387.242,-271.173 387.407,-264.175"/>
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+<!-- 2,3->2,4 -->
+<g id="edge24" class="edge"><title>2,3->2,4</title>
+<path fill="none" stroke="#dd1e2f" d="M501.327,-254.562C510.601,-254.258 520.531,-254.176 530.159,-254.316"/>
+<polygon fill="#dd1e2f" stroke="#dd1e2f" points="530.364,-257.822 540.443,-254.554 530.527,-250.823 530.364,-257.822"/>
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+<!-- 2,4->3,4 -->
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+<!-- 2,4->2,3 -->
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diff --git a/genomix/genomix-pregelix/data/input/graphs/bubblemerge/tip_and_bubble/part-1 b/genomix/genomix-pregelix/data/input/graphs/bubblemerge/tip_and_bubble/part-1
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