/-------------------------------------------------------------------- 18196/15-68  (1)
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      +                          /------------100-----------+                         
      |                          |                          \-------------- 139631/16-70 (3)
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      |             /-----100----+                          /-------------- 270225/20-76 (4)
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      |             |            |             |            \-------------- 270954/15-71 (7)
      \------74-----+            \-----100-----+                                      
                    |                          \--------------------------- 77000/6-64   (8)
                    |                                                                 
                    \------------------------------------------------------ 81609/25-78  (5)
                                                                                      

      /-------------------------------------------------------------------- 139631 (1)
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      |-------------------------------------------------------------------- 6792   (4)
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      |                                                     /-------------- 18217  (2)
      |                                        /-----51-----+                         
      +                                        |            \-------------- 19476  (7)
      |                          /------53-----+                                      
      |                          |             \--------------------------- 18196  (9)
      |             /-----100----+                                                    
      |             |            \----------------------------------------- 81609  (3)
      |             |                                                                 
      \-----100-----+                                       /-------------- 77000  (5)
                    |                          /-----82-----+                         
                    |                          |            \-------------- 270225 (8)
                    \------------100-----------+                                      
                                               \--------------------------- 270954 (6)