Cluster example
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This example is adapted from http://graphviz.org/content/cluster.

USING: graphviz graphviz.notation graphviz.render ; <digraph> "dot" =layout 0 <cluster> "filled" =style "lightgrey" =color [node "filled" =style "white" =color ]; { "a0" "a1" "a2" "a3" } ~-> "process #1" =label add 1 <cluster> [node "filled" =style ]; { "b0" "b1" "b2" "b3" } ~-> "process #2" =label "blue" =color add "start" "a0" -> "start" "b0" -> "a1" "b3" -> "b2" "a3" -> "a3" "a0" -> "a3" "end" -> "b3" "end" -> "start" [add-node "Mdiamond" =shape ]; "end" [add-node "Msquare" =shape ]; preview