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+digraph G {

+

+	subgraph cluster_0 {

+		style=filled;

+		color=lightgrey;

+		node [style=filled,color=white];

+		a0 -> a1 -> a2 -> a3;

+		label = "process #1";

+	}

+

+	subgraph cluster_1 {

+		node [style=filled];

+		b0 -> b1 -> b2 -> b3;

+		label = "process #2";

+		color=blue

+	}

+	start -> a0;

+	start -> b0;

+	a1 -> b3;

+	b2 -> a3;

+	a3 -> a0;

+	a3 -> end;

+	b3 -> end;

+

+	start [shape=Mdiamond];

+	end [shape=Msquare];

+}