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SHLOMIF / Graph-Easy-0.76 / t / out / 4_edge_cross.txt 

             +---------------------+
             |                     |
             |                     |
  +----------+----------+          |
  |          |          v          v
+----+     +----+     +----+     +----+
| E1 | --> | E2 | --> | S1 | --> | S2 |
+----+     +----+     +----+     +----+
  |                                ^
  +--------------------------------+