diff --git a/genomix/genomix-data/src/main/java/edu/uci/ics/genomix/type/PositionListWritable.java b/genomix/genomix-data/src/main/java/edu/uci/ics/genomix/type/PositionListWritable.java
index e449760..d9a409d 100644
--- a/genomix/genomix-data/src/main/java/edu/uci/ics/genomix/type/PositionListWritable.java
+++ b/genomix/genomix-data/src/main/java/edu/uci/ics/genomix/type/PositionListWritable.java
@@ -139,6 +139,14 @@
     protected int getCapacity() {
         return maxStorageSize - offset;
     }
+    
+    public String printReadIdSet(){
+        String output = "";
+        for(int i = 0; i < valueCount - 1; i++)
+            output += getPosition(i).getReadId() + ",";
+        output += getPosition(valueCount - 1).getReadId();
+        return output;
+    }
 
     protected void setCapacity(int new_cap) {
         if (new_cap > getCapacity()) {
diff --git a/genomix/genomix-hadoop/data/webmap/SplitOnce.txt b/genomix/genomix-hadoop/data/webmap/SplitOnce.txt
new file mode 100644
index 0000000..d8e2b7e
--- /dev/null
+++ b/genomix/genomix-hadoop/data/webmap/SplitOnce.txt
@@ -0,0 +1,2 @@
+1	AATAG
+2	GCATA
diff --git a/genomix/genomix-hadoop/data/webmap/SplitRepeat.txt b/genomix/genomix-hadoop/data/webmap/SplitTwice.txt
similarity index 100%
rename from genomix/genomix-hadoop/data/webmap/SplitRepeat.txt
rename to genomix/genomix-hadoop/data/webmap/SplitTwice.txt
diff --git a/genomix/genomix-hadoop/data/webmap/lastesttest/HighSplitRepeat/HighSplitRepeat.txt b/genomix/genomix-hadoop/data/webmap/lastesttest/HighSplitRepeat/HighSplitRepeat.txt
new file mode 100644
index 0000000..eca0a13
--- /dev/null
+++ b/genomix/genomix-hadoop/data/webmap/lastesttest/HighSplitRepeat/HighSplitRepeat.txt
@@ -0,0 +1,3 @@
+1	AGCCACA
+2	GCACTTT
+3	CGCCGTC
diff --git a/genomix/genomix-hadoop/data/webmap/lastesttest/LowSplitRepeat/LowSplitRepeat.txt b/genomix/genomix-hadoop/data/webmap/lastesttest/LowSplitRepeat/LowSplitRepeat.txt
new file mode 100644
index 0000000..259fd80
--- /dev/null
+++ b/genomix/genomix-hadoop/data/webmap/lastesttest/LowSplitRepeat/LowSplitRepeat.txt
@@ -0,0 +1,3 @@
+1	AGCCA
+2	AGCCG
+3	GCCTT
diff --git a/genomix/genomix-hadoop/data/webmap/lastesttest/MidSplitRepeat/MidSplitRepeat.txt b/genomix/genomix-hadoop/data/webmap/lastesttest/MidSplitRepeat/MidSplitRepeat.txt
new file mode 100644
index 0000000..e934e54
--- /dev/null
+++ b/genomix/genomix-hadoop/data/webmap/lastesttest/MidSplitRepeat/MidSplitRepeat.txt
@@ -0,0 +1,3 @@
+1	AGCCA
+2	CGCCT
+3	GCCGG
diff --git a/genomix/genomix-hadoop/data/webmap/lastesttest/Tips1/Tips1.txt b/genomix/genomix-hadoop/data/webmap/lastesttest/Tips1/Tips1.txt
new file mode 100644
index 0000000..1e16d68
--- /dev/null
+++ b/genomix/genomix-hadoop/data/webmap/lastesttest/Tips1/Tips1.txt
@@ -0,0 +1,2 @@
+1	CAGCCA
+2	GCCGTA
diff --git a/genomix/genomix-hadoop/data/webmap/lastesttest/Tips2/Tips2.txt b/genomix/genomix-hadoop/data/webmap/lastesttest/Tips2/Tips2.txt
new file mode 100644
index 0000000..8109730
--- /dev/null
+++ b/genomix/genomix-hadoop/data/webmap/lastesttest/Tips2/Tips2.txt
@@ -0,0 +1,2 @@
+1	ACAGCG
+2	GGCGAA
diff --git a/genomix/genomix-hadoop/data/webmap/lastesttest/Tips3/Tips3.txt b/genomix/genomix-hadoop/data/webmap/lastesttest/Tips3/Tips3.txt
new file mode 100644
index 0000000..a672034
--- /dev/null
+++ b/genomix/genomix-hadoop/data/webmap/lastesttest/Tips3/Tips3.txt
@@ -0,0 +1,2 @@
+1	CAGCCT
+2	CAGCCA
diff --git a/genomix/genomix-hadoop/data/webmap/lastesttest/Tips4/Tips4.txt b/genomix/genomix-hadoop/data/webmap/lastesttest/Tips4/Tips4.txt
new file mode 100644
index 0000000..499e8e6
--- /dev/null
+++ b/genomix/genomix-hadoop/data/webmap/lastesttest/Tips4/Tips4.txt
@@ -0,0 +1,2 @@
+1	CAGGCA
+2	CAGGCC
diff --git a/genomix/genomix-hadoop/src/main/java/edu/uci/ics/genomix/hadoop/contrailgraphbuilding/GenomixMapper.java b/genomix/genomix-hadoop/src/main/java/edu/uci/ics/genomix/hadoop/contrailgraphbuilding/GenomixMapper.java
index 6951e8b..39a7535 100644
--- a/genomix/genomix-hadoop/src/main/java/edu/uci/ics/genomix/hadoop/contrailgraphbuilding/GenomixMapper.java
+++ b/genomix/genomix-hadoop/src/main/java/edu/uci/ics/genomix/hadoop/contrailgraphbuilding/GenomixMapper.java
@@ -93,6 +93,8 @@
             setNodeId(mateId, readID, 1);
             //set value.edgeList
             setEdgeListForNextKmer();
+            //set coverage = 1
+            outputNode.setAvgCoverage(1);
             //output mapper result
             setMapperOutput(output);
             
@@ -107,6 +109,8 @@
                 //set value.edgeList
                 setEdgeListForPreKmer();
                 setEdgeListForNextKmer();
+                //set coverage = 1
+                outputNode.setAvgCoverage(1);
                 //output mapper result
                 setMapperOutput(output);
             }
@@ -119,6 +123,8 @@
         	setNodeId(mateId, readID, array.length - KMER_SIZE + 1);
             //set value.edgeList
             setEdgeListForPreKmer();
+            //set coverage = 1
+            outputNode.setAvgCoverage(1);
             //output mapper result
             setMapperOutput(output);
         }
diff --git a/genomix/genomix-hadoop/src/main/java/edu/uci/ics/genomix/hadoop/contrailgraphbuilding/GenomixReducer.java b/genomix/genomix-hadoop/src/main/java/edu/uci/ics/genomix/hadoop/contrailgraphbuilding/GenomixReducer.java
index 4b79ea4..e8e41c4 100644
--- a/genomix/genomix-hadoop/src/main/java/edu/uci/ics/genomix/hadoop/contrailgraphbuilding/GenomixReducer.java
+++ b/genomix/genomix-hadoop/src/main/java/edu/uci/ics/genomix/hadoop/contrailgraphbuilding/GenomixReducer.java
@@ -19,6 +19,7 @@
     public static int KMER_SIZE;
     private NodeWritable outputNode;
     private NodeWritable tmpNode;
+    private float averageCoverage;
     
     @Override
     public void configure(JobConf job) {
@@ -32,6 +33,7 @@
 			OutputCollector<VKmerBytesWritable, NodeWritable> output,
 			Reporter reporter) throws IOException {
 		outputNode.reset();
+		averageCoverage = 0;
 		
 		while (values.hasNext()) {
 		    tmpNode.set(values.next());
@@ -40,7 +42,9 @@
 		    outputNode.getFRList().unionUpdate(tmpNode.getFRList());
 		    outputNode.getRFList().unionUpdate(tmpNode.getRFList());
 		    outputNode.getRRList().unionUpdate(tmpNode.getRRList());
+		    averageCoverage += tmpNode.getAvgCoverage();
 		}
+		outputNode.setAvgCoverage(averageCoverage);
 		output.collect(key,outputNode);
 	}
 
diff --git a/genomix/genomix-hadoop/src/test/java/edu/uci/ics/genomix/hadoop/contrailgraphbuilding/GraphBuildingTestCase.java b/genomix/genomix-hadoop/src/test/java/edu/uci/ics/genomix/hadoop/contrailgraphbuilding/GraphBuildingTestCase.java
index 1916fc2..44f3168 100644
--- a/genomix/genomix-hadoop/src/test/java/edu/uci/ics/genomix/hadoop/contrailgraphbuilding/GraphBuildingTestCase.java
+++ b/genomix/genomix-hadoop/src/test/java/edu/uci/ics/genomix/hadoop/contrailgraphbuilding/GraphBuildingTestCase.java
@@ -11,6 +11,7 @@
 import org.apache.hadoop.mapred.JobConf;
 import org.junit.Test;
 
+import edu.uci.ics.genomix.hadoop.graph.GenerateGraphViz;
 import edu.uci.ics.genomix.hadoop.pmcommon.HadoopMiniClusterTest;
 
 
@@ -59,10 +60,11 @@
     
     
     
-    private void dumpResult() throws IOException {
+    private void dumpResult() throws Exception {
 //        Path src = new Path(RESULT_PATH);
 //        Path dest = new Path(RESULT_PATH);
 //        dfs.copyToLocalFile(src, dest);
         HadoopMiniClusterTest.copyResultsToLocal(RESULT_PATH, RESULT_PATH + "/test.txt", false, conf, true, dfs);
+        GenerateGraphViz.convertGraphBuildingOutputToGraphViz(RESULT_PATH + "/test.txt.bindir", RESULT_PATH + "/graphviz");
     }
 }
diff --git a/genomix/genomix-hadoop/src/test/java/edu/uci/ics/genomix/hadoop/contrailgraphbuilding/GraphBuildingTestSuite.java b/genomix/genomix-hadoop/src/test/java/edu/uci/ics/genomix/hadoop/contrailgraphbuilding/GraphBuildingTestSuite.java
index dd9c05f..30e75cf 100644
--- a/genomix/genomix-hadoop/src/test/java/edu/uci/ics/genomix/hadoop/contrailgraphbuilding/GraphBuildingTestSuite.java
+++ b/genomix/genomix-hadoop/src/test/java/edu/uci/ics/genomix/hadoop/contrailgraphbuilding/GraphBuildingTestSuite.java
@@ -22,16 +22,23 @@
 public class GraphBuildingTestSuite extends TestSuite{
 
     private static int SIZE_KMER = 3;
-    public static final String PreFix = "data/webmap/pathmerge_TestSet"; 
+    public static final String PreFix = "data/webmap/lastesttest"; 
     public static final String[] TestDir = { PreFix + File.separator
-        + "2", PreFix + File.separator
-        + "3", PreFix + File.separator
-        + "4", PreFix + File.separator
-        + "5", PreFix + File.separator
-        + "6", PreFix + File.separator
-        + "7", PreFix + File.separator
-        + "8", PreFix + File.separator
-        + "9"};
+//        + "2", PreFix + File.separator
+//        + "3", PreFix + File.separator
+//        + "4", PreFix + File.separator
+//        + "5", PreFix + File.separator
+//        + "6", PreFix + File.separator
+//        + "7", PreFix + File.separator
+//        + "8", PreFix + File.separator
+//        + "9"};
+        + "HighSplitRepeat", PreFix + File.separator
+        + "LowSplitRepeat", PreFix + File.separator
+        + "MidSplitRepeat", PreFix + File.separator
+        + "Tips1", PreFix + File.separator
+        + "Tips2", PreFix + File.separator
+        + "Tips3", PreFix + File.separator
+        + "Tips4"};
     
     private static JobConf conf = new JobConf();
     private static final String ACTUAL_RESULT_DIR = "actual";
diff --git a/genomix/genomix-hadoop/src/test/java/edu/uci/ics/genomix/hadoop/pmcommon/HadoopMiniClusterTest.java b/genomix/genomix-hadoop/src/test/java/edu/uci/ics/genomix/hadoop/pmcommon/HadoopMiniClusterTest.java
index 0c92afe..3788a27 100644
--- a/genomix/genomix-hadoop/src/test/java/edu/uci/ics/genomix/hadoop/pmcommon/HadoopMiniClusterTest.java
+++ b/genomix/genomix-hadoop/src/test/java/edu/uci/ics/genomix/hadoop/pmcommon/HadoopMiniClusterTest.java
@@ -7,7 +7,6 @@
 import java.io.FileWriter;
 import java.io.IOException;
 import java.util.ArrayList;
-import java.util.Arrays;
 
 import org.apache.commons.io.FileUtils;
 import org.apache.commons.lang3.ArrayUtils;
@@ -19,14 +18,10 @@
 import org.apache.hadoop.hdfs.MiniDFSCluster;
 import org.apache.hadoop.io.SequenceFile;
 import org.apache.hadoop.io.Writable;
-import org.apache.hadoop.mapred.FileInputFormat;
-import org.apache.hadoop.mapred.FileOutputFormat;
 import org.apache.hadoop.mapred.JobConf;
 import org.apache.hadoop.mapred.MiniMRCluster;
 import org.apache.hadoop.util.ReflectionUtils;
-import org.junit.After;
 import org.junit.AfterClass;
-import org.junit.Before;
 import org.junit.BeforeClass;
 
 //import edu.uci.ics.genomix.hadoop.velvetgraphbuilding.GraphBuildingDriver;
diff --git a/genomix/genomix-pregelix/data/result/LogAlgorithmForMergeGraph/graphviz/2/result.ps b/genomix/genomix-pregelix/data/result/LogAlgorithmForMergeGraph/graphviz/2/result.ps
new file mode 100644
index 0000000..19f638a
--- /dev/null
+++ b/genomix/genomix-pregelix/data/result/LogAlgorithmForMergeGraph/graphviz/2/result.ps
@@ -0,0 +1,206 @@
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diff --git a/genomix/genomix-pregelix/data/result/LogAlgorithmForMergeGraph/graphviz/3/result.ps b/genomix/genomix-pregelix/data/result/LogAlgorithmForMergeGraph/graphviz/3/result.ps
new file mode 100644
index 0000000..aa8e89c
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+++ b/genomix/genomix-pregelix/data/result/LogAlgorithmForMergeGraph/graphviz/3/result.ps
@@ -0,0 +1,206 @@
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+++ 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()){