+-----------+ +--------+ +---------+
| Bonn | --> | Berlin | ..> | Cottbus |
+-----------+ +--------+ +---------+
|
|
v
+-----------+
| Frankfurt |
+-----------+
+-----------+ +--------+ +---------+
| Bonn | --> | Berlin | ..> | Cottbus |
+-----------+ +--------+ +---------+
|
|
v
+-----------+
| Frankfurt |
+-----------+