public ArrayList<Integer> findIncidentEdgesToHighlight(){
    	 ArrayList<Integer>edges = new ArrayList<Integer>();
    	 ArrayList<Integer>edgesToHighlight = new ArrayList<Integer>();
    	 for (int i=0;i<this.aggregatedNodes.size();i++){
    		 edges=this.nodes.get(this.aggregatedNodes.get(i)).incidentEdges;
    		 for (int j=0;j<edges.size();j++){
    			 if (!edgesToHighlight.contains(edges.get(j)))
    			      edgesToHighlight.add(edges.get(j));
    		 }
    	 }
    	 return edgesToHighlight;
     }