Rough Dentogram ( clustering based on segment distance )

   AE  30  35 
   !  
   5--AE  20  25 
   !     
   !     AE  11  15 
   !     !  
   3-----1--AE   5   7 
   !           
   2-----------AL  16  19 
   !              
   4--------------AL  26  29 
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