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SHLOMIF / Graph-Easy-0.72 / t / out / 4_collapse.txt 
+-----------+  S P A C E   +-----------+
| S P A C E | -----------> | S P A C Y |
+-----------+              +-----------+
+-----------+  A B C D     +-----------+
|   A B C   | -----------> |   X Z Y   |
+-----------+              +-----------+