/-------------------------------------------------------------------- PK12143.1/42-81   (1)
      |                                                                               
      |                                            /----------------------- PK27683.1/191-227 (4)
      |                      /----------64---------+                                  
      |                      |                     \----------------------- PK22848.1/581-619 (6)
      +----------100---------+                                                        
      |                      \--------------------------------------------- PK12143.1/126-165 (5)
      |                                                                               
      |                                            /----------------------- PK27683.1/131-169 (2)
      \---------------------82---------------------+                                  
                                                   \----------------------- PK22848.1/497-534 (3)