/-------------------------------------------------------------------- 890147/67-115 (1)
      |                                                                               
      |-------------------------------------------------------------------- 476011/63-111 (2)
      |                                                                               
      +                                            /----------------------- 888685/60-108 (3)
      |                      /----------87---------+                                  
      |                      |                     \----------------------- 484335/56-104 (4)
      \----------50----------+                                                        
                             |                     /----------------------- 474200/27-73  (5)
                             \---------100---------+                                  
                                                   \----------------------- 474227/46-93  (6)
                                                                                      

      /-------------------------------------------------------------------- 474200 (1)
      |                                                                               
      |-------------------------------------------------------------------- 474227 (2)
      |                                                                               
      +                                            /----------------------- 890147 (3)
      |                      /----------87---------+                                  
      |                      |                     \----------------------- 476011 (6)
      \----------100---------+                                                        
                             |                     /----------------------- 484335 (4)
                             \----------99---------+                                  
                                                   \----------------------- 888685 (5)