Rough Dentogram ( clustering based on segment distance )

   AH  26  36 
   !  
   5--AL   1   9 
   !     
   !     AE  22  23 
   !     !  
   !     4--AE  15  16 
   !     !     
   !     3-----AL  17  21 
   !     !        
   !     7--------AL  47  55 
   !     !           
   !     6-----------AL  37  46 
   !     !              
   1-----2--------------AL  10  14 
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