Rough Dentogram ( clustering based on segment distance )

   AH 66  77  
   !  
   7--AL 44  52  
   !     
   !     AL 62  65  
   !     !  
   5-----6--AL 53  61  
   !           
   !           AH 31  43  
   !           !  
   !           3--AL 23  30  
   !           !     
   !           !     AH 12  22  
   !           !     !  
   4-----------2-----1--AL  1   9  
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