digraph VisualPlan {
	subgraph cluster_3 {
		18 -> 19;
		19 -> 20;
		19 -> 26	[ label=Map];
		26 -> 27;
		17 -> 18;
	}
	2 -> 17	//[ label=Map];
	2 -> 3;
	3 -> 4;
	4 -> 5;
}