1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16

digraph small {
  0 -> 1;
  0 -> 3;
  1 -> 2;
  1 -> 4;
  2 -> 3;
  2 -> 5;
  3 -> 4;
  3 -> 6;
  4 -> 5;
  4 -> 0;
  5 -> 6;
  5 -> 1;
  6 -> 0;
  6 -> 2;
}