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TELS / Graph-Easy-0.64 / t / out / 4_lists.txt 
+--------+     +-----------+
|  Bonn  | --> | Frankfurt |
+--------+     +-----------+
  |              ^
  |              |
  v              |
+--------+     +-----------+
| Berlin | <-- |    Ulm    |
+--------+     +-----------+