digraph G { bgcolor="purple:pink" label="Graph" fontcolor="white" subgraph cluster1 { bgcolor="blue:green" label="Cluster" fontcolor="white" a0 [shape=circle fillcolor="gold:brown" style="radial" gradientangle=180] a0 [label=<
00 01 02 03 04 05 06 07 08
10 11 12 13 14 15 16 17 18
20 21 22 23 24 25 26 27 28
30 31 32 33 34 35 36 37 38
40 41 42 43 44 45 46 47 48
50 51 52 53 54 55 56 57 58
60 61 62 63 64 65 66 67 68
70 71 72 73 74 75 76 77 78
80 81 82 83 84 85 86 87 88
>]; } }