Rough Dentogram ( clustering based on segment distance )

    L 38  46  
   !  
   5-- L 10  18  
   !     
   !      H 54  57  
   !     !  
   !     7-- L 48  53  
   !     !     
   !     !      E 31  37  
   !     !     !  
   !     6-----4-- E 20  26  
   !     !           
   !     !            L 27  30  
   !     !           !  
   2-----1-----------3-- L  1   9  
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