Rough Dentogram ( clustering based on segment distance )

   AL  54  62 
   !  
   4--AL  45  53 
   !     
   !     AL  36  44 
   !     !  
   3-----2--AH  30  35 
   !           
   5-----------AH  63  75 
   !              
   1--------------AH  15  30 
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