Rough Dentogram ( clustering based on segment distance )

    E 37  38  
   !  
   8-- E 30  31  
   !     
   7----- L 32  36  
   !        
   6-------- L 27  29  
   !           
   !            E 24  26  
   !           !  
   !           4-- E 13  15  
   !           !     
   5-----------2----- L 10  12  
   !                    
   1-------------------- L  1   9  
   !                       
   3----------------------- L 16  23  
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