Rough Dentogram ( clustering based on segment distance )

    E  17  23 
   !  
   3-- E   2   4 
   !     
   !      E  41  46 
   !     !  
   6-----2-- E  30  38 
   !           
   4----------- L  24  29 
   !              
   !               L  14  16 
   !              !  
   5--------------1-- L   5  13 
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