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SHLOMIF / Graph-Easy-0.72 / t / out / 6_ranks.txt 
+---+     +---+     +---+
| A | --> | B | --> | C |
+---+     +---+     +---+
                      |
  +-------------------+
  v
+---+     +---+
| D | --> | E |
+---+     +---+
            |
  +---------+
  v
+---+
| F |
+---+