Rough Dentogram ( clustering based on segment distance )

   AL  58  66 
   !  
   7--AL  49  57 
   !     
   8-----AL  67  75 
   !        
   9--------AL  76  84 
   !           
   !           AH  36  39 
   !           !  
   !           4--AL  28  35 
   !           !     
   !           5-----AL  40  48 
   !           !        
   6-----------3--------AL  19  27 
   !                       
   !                       AL  10  18 
   !                       !  
   2-----------------------1--AL   1   9 
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