digraph foogrph {
  node [shape = record,height=.1];
  node27[label = "<left> |<center> 27|<right> "];
  "node27":left -> "node26":center;
  node26[label = "<left> |<center> 26|<right> "];
  "node26":left -> "node24":center;
  node24[label = "<left> |<center> 24|<right> "];
  "node24":right -> "node21":center;
  node21[label = "<left> |<center> 21|<right> "];
  "node27":right -> "node25":center;
  node25[label = "<left> |<center> 25|<right> "];
  "node25":left -> "node23":center;
  node23[label = "<left> |<center> 23|<right> "];
  "node25":right -> "node22":center;
  node22[label = "<left> |<center> 22|<right> "];
}