+-------------------------------------------+
  |                                           v
+---------+     +-----+     +---------+     +--------+     +--------+
|  Bonn   | --> | Ulm | --> | Bautzen | --> | Berlin | --> | Kassel |
+---------+     +-----+     +---------+     +--------+     +--------+
  |               |
  |               |
  v               |
+---------+       |
| Koblenz | <-----+
+---------+