Digraph with circles output

strict digraph {

16->17;

0->1;

0->2;

1->2;

1->3;

2->3;

2->4;

19->19;

3->4;

3->5;

4->5;

4->6;

5->6;

5->7;

6->7;

6->8;

7->1;

7->5;

15->16;

//4 circles detected

6->7[label=0, color=red,penwidth=2.0];

5->6[label=0, color=red,penwidth=2.0];

7->5[label=0, color=red,penwidth=2.0];

6->7[label=1, color=blue,penwidth=2.5];

5->6[label=1, color=blue,penwidth=2.5];

4->5[label=1, color=blue,penwidth=2.5];

2->4[label=1, color=blue,penwidth=2.5];

1->2[label=1, color=blue,penwidth=2.5];

7->1[label=1, color=blue,penwidth=2.5];

6->7[label=2, color=green,penwidth=3.0];

5->6[label=2, color=green,penwidth=3.0];

4->5[label=2, color=green,penwidth=3.0];

3->4[label=2, color=green,penwidth=3.0];

1->3[label=2, color=green,penwidth=3.0];

7->1[label=2, color=green,penwidth=3.0];

6->7[label=3, color=purple,penwidth=3.5];

5->6[label=3, color=purple,penwidth=3.5];

4->5[label=3, color=purple,penwidth=3.5];

3->4[label=3, color=purple,penwidth=3.5];

2->3[label=3, color=purple,penwidth=3.5];

1->2[label=3, color=purple,penwidth=3.5];

7->1[label=3, color=purple,penwidth=3.5];

}

number of points: 13

number of edges: 19

find circle:true