digraph chapter01 {
	rankdir=BT;
	subgraph cluster_Nodes {
		Start1 [ shape=box style=filled fillcolor=yellow label="Start" ];
		Con12 [ label="Con1" ];
		Return3 [ shape=box style=filled fillcolor=yellow label="Return" ];
	}
	Con12 -> Start1 [style=dotted];
	Return3 -> Start1 [color=red];
	Return3 -> Con12;
}