Rough Dentogram ( clustering based on segment distance )

   BL 64  72  
   !  
   7--BL 55  63  
   !     
   !     BL 20  26  
   !     !  
   6-----2--BH 12  19  
   !           
   !           BH 48  54  
   !           !  
   !           5--BH 27  38  
   !           !     
   3-----------4-----BL 39  47  
   !                    
   1--------------------BL  1   9  
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