Rough Dentogram ( clustering based on segment distance )

    L 36  39  
   !  
   4-- H 28  35  
   !     
   3----- H 40  53  
   !        
   !         E 66  68  
   !        !  
   !        8-- E 56  58  
   !        !     
   !        7----- L 59  65  
   !        !        
   !        !         L 23  27  
   !        !        !  
   !        5--------2-- H 21  22  
   !        !              
   6--------1-------------- H  6  21  
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