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SHLOMIF / Graph-Easy-0.72 / t / out / dot / 9_back.txt 
+---+     +----+     +----+     +---+     +---+     +---+
| 0 | --> | 11 | --> | 1  | --> | 2 | --> | 3 | --> | 8 |
+---+     +----+     +----+     +---+     +---+     +---+
                       |                              ^
                       |                              |
                       v                              |
                     +----+     +---+     +---+       |
                     | 10 | --> | 6 | <-- | 5 | ------+
                     +----+     +---+     +---+