ArrayList <Edge> edges = new ArrayList <Edge> ();
Node n1 = new NodeType1("Node 1");
Node sn1 = new NodeType2("Node 2");
Node sn2 = new NodeType2("Node 3");
ClusterNode sn3 = new NodeType4("Node 4", 19);
Node sn4 = new NodeType2("Node 5");
Node sn5 = new NodeType2("Node 6");
Node sn6 = new NodeType2("Multi Line\nNode Label");
Node ssn1 = new NodeType3("Node 7");
Node ssn2 = new NodeType3("Node 8");