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1digraph G {
2
3  subgraph cluster0 {  //subgraph<Graph>
4    node [style=filled color=white];
5    style = filled;
6    bgcolor = lightgrey;
7
8    subgraph inner { //subgraph<Graph> or subgraph of subgraph
9	node [color = green];
10	a1 -> a2 -> a3
11
12    };
13
14    a0 -> subgraph inner;
15
16    label = "process #1";
17  }
18
19  subgraph cluster1 {
20    node [style=filled color=white];
21    b0 -> b1 -> b2 -> b3;
22    label = "process #2";
23    bgcolor = lightgrey
24  }
25
26  subgraph cluster1 -> subgraph cluster0 [style=dashed color=red]
27
28  start -> subgraph inner[style=dotted];
29
30  start -> a0;
31  start -> b0;
32  a1 -> b3;
33  b2 -> a3;
34  a3 -> end;
35  b3 -> end;
36
37  start [shape=Mdiamond];
38  end [shape=Msquare];
39}
40