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diff --git a/genomix/genomix-pregelix/data/result/P4ForMergeGraph/graphviz/9/result.ps b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/graphviz/9/result.ps
new file mode 100644
index 0000000..19f638a
--- /dev/null
+++ b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/graphviz/9/result.ps
@@ -0,0 +1,206 @@
+%!PS-Adobe-3.0
+%%Creator: graphviz version 2.26.3 (20100126.1600)
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diff --git a/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/.2.crc b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/.2.crc
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/.2.crc
diff --git a/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/.3.crc b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/.3.crc
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/.3.crc
diff --git a/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/.4.crc b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/.4.crc
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/.4.crc
diff --git a/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/.5.crc b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/.5.crc
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/.5.crc
diff --git a/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/.6.crc b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/.6.crc
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/.6.crc
diff --git a/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/.7.crc b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/.7.crc
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/.7.crc
diff --git a/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/.8.crc b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/.8.crc
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/.8.crc
diff --git a/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/.9.crc b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/.9.crc
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/.9.crc
diff --git a/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/2 b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/2
new file mode 100755
index 0000000..f00dc00
--- /dev/null
+++ b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/2
@@ -0,0 +1 @@
+AAT	{[(1-1_0)]	[]	[]	[]	[]	AATA}
diff --git a/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/3 b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/3
new file mode 100755
index 0000000..588691b
--- /dev/null
+++ b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/3
@@ -0,0 +1 @@
+AAT	{[(1-1_0)]	[]	[]	[]	[]	AATAG}
diff --git a/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/4 b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/4
new file mode 100755
index 0000000..15476c2
--- /dev/null
+++ b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/4
@@ -0,0 +1 @@
+AAT	{[(1-1_0)]	[]	[]	[]	[]	AATAGA}
diff --git a/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/5 b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/5
new file mode 100755
index 0000000..33b2666
--- /dev/null
+++ b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/5
@@ -0,0 +1 @@
+AAT	{[(1-1_0)]	[]	[]	[]	[]	AATAGAA}
diff --git a/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/6 b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/6
new file mode 100755
index 0000000..c6ca9b5
--- /dev/null
+++ b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/6
@@ -0,0 +1 @@
+AAT	{[(1-1_0)]	[]	[]	[]	[]	AATAGAAC}
diff --git a/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/7 b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/7
new file mode 100755
index 0000000..bc487c7
--- /dev/null
+++ b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/7
@@ -0,0 +1 @@
+AAT	{[(1-1_0)]	[]	[]	[]	[]	AATAGAACT}
diff --git a/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/8 b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/8
new file mode 100755
index 0000000..f85f319
--- /dev/null
+++ b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/8
@@ -0,0 +1 @@
+AAT	{[(1-1_0)]	[]	[]	[]	[]	AATAGAACTT}
diff --git a/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/9 b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/9
new file mode 100755
index 0000000..30986e1
--- /dev/null
+++ b/genomix/genomix-pregelix/data/result/P4ForMergeGraph/txt/9
@@ -0,0 +1 @@
+AAT	{[(1-1_0)]	[]	[]	[]	[]	AATAGAACTTA}
diff --git a/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/graph/GenerateGraphViz.java b/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/graph/GenerateGraphViz.java
index 0b89769..89abdc2 100644
--- a/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/graph/GenerateGraphViz.java
+++ b/genomix/genomix-pregelix/src/main/java/edu/uci/ics/genomix/pregelix/graph/GenerateGraphViz.java
@@ -11,6 +11,7 @@
 import org.apache.hadoop.io.SequenceFile;
 
 import edu.uci.ics.genomix.pregelix.io.VertexValueWritable;
+import edu.uci.ics.genomix.type.NodeWritable;
 import edu.uci.ics.genomix.type.VKmerBytesWritable;
 
 public class GenerateGraphViz {
@@ -19,6 +20,52 @@
      * Construct a DOT graph in memory, convert it
      * to image and store the image in the file system.
      */
+    public static void convertGraphBuildingOutputToGraphViz(String srcDir, String destDir) throws Exception {
+        GraphViz gv = new GraphViz();
+        gv.addln(gv.start_graph());
+        
+        Configuration conf = new Configuration();
+        FileSystem fileSys = FileSystem.getLocal(conf);
+        File srcPath = new File(srcDir);
+
+        String outputNode = "";
+        String outputEdge = "";
+        for (File f : srcPath.listFiles((FilenameFilter) (new WildcardFileFilter("part*")))) {
+            SequenceFile.Reader reader = new SequenceFile.Reader(fileSys, new Path(f.getAbsolutePath()), conf);
+            VKmerBytesWritable key = new VKmerBytesWritable();
+            NodeWritable value = new NodeWritable();
+            
+            gv.addln("rankdir=LR\n");
+            
+            while (reader.next(key, value)) {
+                outputNode = "";
+                outputEdge = "";
+                if (key == null) {
+                    break;
+                }
+                outputNode += key.toString();
+                /** convert edge to graph **/
+                outputEdge = convertEdgeToGraph(outputNode, value);
+                gv.addln(outputEdge);
+                /** add readIdSet **/
+                outputNode += " [shape=record, label = \"<f0> " + key.toString() 
+                        + "|<f1> " + value.getNodeIdList().printReadIdSet()
+                        + "\"]\n";
+                gv.addln(outputNode);
+            }
+            reader.close();
+        }
+        
+        gv.addln(gv.end_graph());
+        System.out.println(gv.getDotSource());
+
+        String type = "ps";
+        File folder = new File(destDir);
+        folder.mkdirs();
+        File out = new File(destDir + "/result." + type); // Linux
+        gv.writeGraphToFile(gv.getGraph(gv.getDotSource(), type), out);
+    }
+    
     public static void convertGraphCleanOutputToGraphViz(String srcDir, String destDir) throws Exception {
         GraphViz gv = new GraphViz();
         gv.addln(gv.start_graph());
@@ -34,6 +81,8 @@
             VKmerBytesWritable key = new VKmerBytesWritable();
             VertexValueWritable value = new VertexValueWritable();
             
+            gv.addln("rankdir=LR\n");
+            
             while (reader.next(key, value)) {
                 outputNode = "";
                 outputEdge = "";
@@ -44,6 +93,11 @@
                 /** convert edge to graph **/
                 outputEdge = convertEdgeToGraph(outputNode, value);
                 gv.addln(outputEdge);
+                /** add readIdSet **/
+                outputNode += " [shape=record, label = \"<f0> " + key.toString() 
+                        + "|<f1> " + value.getNodeIdList().printReadIdSet()
+                        + "\"]\n";
+                gv.addln(outputNode);
             }
             reader.close();
         }
@@ -58,6 +112,47 @@
         gv.writeGraphToFile(gv.getGraph(gv.getDotSource(), type), out);
     }
     
+    /**
+     * For graph building
+     * @param outputNode
+     * @param value
+     * @return
+     */
+    public static String convertEdgeToGraph(String outputNode, NodeWritable value){
+        String outputEdge = "";
+        Iterator<VKmerBytesWritable> kmerIterator;
+        kmerIterator = value.getFFList().iterator();
+        while(kmerIterator.hasNext()){
+            VKmerBytesWritable edge = kmerIterator.next(); 
+            outputEdge += outputNode + " -> " + edge.toString() + "[color = \"black\" label =\"FF\"]\n";
+        }
+        kmerIterator = value.getFRList().iterator();
+        while(kmerIterator.hasNext()){
+            VKmerBytesWritable edge = kmerIterator.next();
+            outputEdge += outputNode + " -> " + edge.toString() + "[color = \"blue\" label =\"FR\"]\n";
+        }
+        kmerIterator = value.getRFList().iterator();
+        while(kmerIterator.hasNext()){
+            VKmerBytesWritable edge = kmerIterator.next();
+            outputEdge += outputNode + " -> " + edge.toString() + "[color = \"green\" label =\"RF\"]\n";
+        }
+        kmerIterator = value.getRRList().iterator();
+        while(kmerIterator.hasNext()){
+            VKmerBytesWritable edge = kmerIterator.next();
+            outputEdge += outputNode + " -> " + edge.toString() + "[color = \"red\" label =\"RR\"]\n";
+        }
+        //TODO should output actualKmer instead of kmer
+        if(outputEdge == "")
+            outputEdge += outputNode;
+        return outputEdge;
+    }
+    
+    /**
+     * For graph clean
+     * @param outputNode
+     * @param value
+     * @return
+     */
     public static String convertEdgeToGraph(String outputNode, VertexValueWritable value){
         String outputEdge = "";
         Iterator<VKmerBytesWritable> kmerIterator;
@@ -69,12 +164,12 @@
         kmerIterator = value.getFRList().iterator();
         while(kmerIterator.hasNext()){
             VKmerBytesWritable edge = kmerIterator.next();
-            outputEdge += outputNode + " -> " + edge.toString() + "[color = \"black\" label =\"FR\"]\n";
+            outputEdge += outputNode + " -> " + edge.toString() + "[color = \"blue\" label =\"FR\"]\n";
         }
         kmerIterator = value.getRFList().iterator();
         while(kmerIterator.hasNext()){
             VKmerBytesWritable edge = kmerIterator.next();
-            outputEdge += outputNode + " -> " + edge.toString() + "[color = \"red\" label =\"RF\"]\n";
+            outputEdge += outputNode + " -> " + edge.toString() + "[color = \"green\" label =\"RF\"]\n";
         }
         kmerIterator = value.getRRList().iterator();
         while(kmerIterator.hasNext()){