# http://www.graphviz.org/Gallery/directed/cluster.html 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]; }
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