Rough Dentogram ( clustering based on segment distance )

   AH  67  71 
   !  
   6--AL  59  66 
   !     
   5-----AH  49  58 
   !        
   !        AL  22  30 
   !        !  
   !        1--AH  14  21 
   !        !     
   !        2-----AL  31  33 
   !        !        
   4--------3--------AH  34  49 
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