_____                               
                 /     \                              
                 |      \___         -----           
                 |          |       /     \_          
                 |          |    --/        |__       
                /            \__/              \      
         /-----/       xx                       |    
        |              xx                       |     
        |            Hamburg                   |      
        |                                      |      
       /                                  xx    \     
      |                                   xx     |   
      |                                 Berlin   |    
     /                                            |   
  /-/                                             |   
 |                                                |   
 |      xx                                        |  
 |      xx                                        |   
 |       Bonn                                     |   
 |                                           -----/   
 \                                          /         
  |             Frankfurt                /--          
  |            xx                     --/             
  |            xx                    |               
  \                                  |                
   |                                 |                
   |                                 \                
   \--                                \               
      \-----\                          \__            
            |                             \_          
            /                               |         
           |                     München  /-          
           |  Freiburg          xx      /-            
           | xx                 xx      |             
            \xx                         |            
             \_________________________/