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SHLOMIF / Graph-Easy-0.75 / t / out / 4_cross_inv.txt 
          +---+
          | C |
          +---+
            '
            '
            '
+---+       '       +---+
| A |       '       | B |
+---+       '       +---+
            '
            '
            v
          +---+
          | D |
          +---+