Rough Dentogram ( clustering based on segment distance )

   AL  73  77 
   !  
   8--AL  64  72 
   !     
   7-----AH  26  36 
   !        
   !        AE  78  79 
   !        !  
   !        9--AE  62  63 
   !        !     
   !        6-----AL  59  61 
   !        !        
   !        4--------AL  17  25 
   !        !           
   !        5-----------AH  48  58 
   !        !              
   2--------1--------------AH   9  16 
   !                          
   3--------------------------AL  37  45 
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