digraph Q {
  node [shape=record];

  Z    [label = "début"];
  A   [label = "A"];
  AB   [label = "AB"];
  B   [label = "B"];
  C    [label = "Échelle\nC"];
  D   [label = "D"];
  E   [label = "Série d'objets\nE"];

  Z -> {A D};
  A -> AB -> B;
  A -> D;
  A -> C -> A;
  B -> D;
  D -> C -> D;
  D -> E -> D
}
