Rough Dentogram ( clustering based on segment distance )

   AL  24  29 
   !  
   3--AL   1   9 
   !     
   6-----AH  48  55 
   !        
   !        AL  36  44 
   !        !  
   !        5--AL  10  17 
   !        !     
   !        !     AE  30  35 
   !        !     !  
   1--------2-----4--AE  18  23 
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