+---------+ +-----------+
| Bonn | --> | Berlin |
+---------+ +-----------+
|
|
v
+---------+ +-----------+ +-----+
| Cottbus | --> | Moselkern | --> | Ulm |
+---------+ +-----------+ +-----+
+---------+ +-----------+
| Bonn | --> | Berlin |
+---------+ +-----------+
|
|
v
+---------+ +-----------+ +-----+
| Cottbus | --> | Moselkern | --> | Ulm |
+---------+ +-----------+ +-----+