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