use SimpleBubbleMerge in driver
diff --git a/genomix/genomix-data/src/main/java/edu/uci/ics/genomix/config/GenomixJobConf.java b/genomix/genomix-data/src/main/java/edu/uci/ics/genomix/config/GenomixJobConf.java
index 20e57d9..8bc2d98 100644
--- a/genomix/genomix-data/src/main/java/edu/uci/ics/genomix/config/GenomixJobConf.java
+++ b/genomix/genomix-data/src/main/java/edu/uci/ics/genomix/config/GenomixJobConf.java
@@ -168,6 +168,7 @@
         UNROLL_TANDEM,
         BRIDGE,
         BUBBLE,
+        BUBBLE_COMPLEX,
         LOW_COVERAGE,
         TIP_REMOVE,
         SCAFFOLD,
diff --git a/genomix/genomix-driver/src/main/java/edu/uci/ics/genomix/driver/GenomixDriver.java b/genomix/genomix-driver/src/main/java/edu/uci/ics/genomix/driver/GenomixDriver.java
index d31094e..17734a7 100644
--- a/genomix/genomix-driver/src/main/java/edu/uci/ics/genomix/driver/GenomixDriver.java
+++ b/genomix/genomix-driver/src/main/java/edu/uci/ics/genomix/driver/GenomixDriver.java
@@ -40,6 +40,7 @@
 import edu.uci.ics.genomix.pregelix.format.P2InitialGraphCleanInputFormat;
 import edu.uci.ics.genomix.pregelix.operator.bridgeremove.BridgeRemoveVertex;
 import edu.uci.ics.genomix.pregelix.operator.bubblemerge.ComplexBubbleMergeVertex;
+import edu.uci.ics.genomix.pregelix.operator.bubblemerge.SimpleBubbleMergeVertex;
 import edu.uci.ics.genomix.pregelix.operator.pathmerge.P1ForPathMergeVertex;
 import edu.uci.ics.genomix.pregelix.operator.pathmerge.P2ForPathMergeVertex;
 import edu.uci.ics.genomix.pregelix.operator.pathmerge.P4ForPathMergeVertex;
@@ -109,6 +110,9 @@
                 queuePregelixJob(TipRemoveVertex.getConfiguredJob(conf, TipRemoveVertex.class));
                 break;
             case BUBBLE:
+                queuePregelixJob(SimpleBubbleMergeVertex.getConfiguredJob(conf, SimpleBubbleMergeVertex.class));
+                break;
+            case BUBBLE_COMPLEX:
                 queuePregelixJob(ComplexBubbleMergeVertex.getConfiguredJob(conf, ComplexBubbleMergeVertex.class));
                 break;
             case LOW_COVERAGE: