path: root/Info/11/NTG/1/Intro/quiz/equivalent.dot

digraph{
  A -> B
  B -> A
  B -> C
  C -> D
  D -> A
  A -> D


  A2 -> B2 [dir=none]
  B2 -> C2
  C2 -> D2
  D2 -> A2 [dir=none]
}