Rough Dentogram ( clustering based on segment distance )

   AH 39  42  
   !  
   5--AL 34  38  
   !     
   7-----AH 52  64  
   !        
   6--------AL 43  51  
   !           
   !           AL 25  33  
   !           !  
   !           3--AH 20  24  
   !           !     
   !           !     AL 14  19  
   !           !     !  
   4-----------2-----1--AH  8  13  
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