1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

digraph small {
  2 -> 0;
  0 -> 1;
  10 -> 1;
  0 -> 2;
  1 -> 2;
  0 -> 3;
  1 -> 3;
  1 -> 4;
  3 -> 4;
  8 -> 4;
  4 -> 5;
  4 -> 6;
  5 -> 6;
  9 -> 6;
  6 -> 7;
  5 -> 8;
  7 -> 9;
  8 -> 9;
}