Rough Dentogram ( clustering based on segment distance )

    E 31  35  
   !  
   4-- E 20  24  
   !     
   6----- E 45  46  
   !        
   3-------- L 25  30  
   !           
   !            E 61  65  
   !           !  
   !           9-- E 48  50  
   !           !     
   !           11---- E 71  74  
   !           !        
   !           10------- L 66  70  
   !           !           
   7-----------2----------- L 51  59  
   !                          
   12------------------------- L 75  84  
   !                             
   !                              L 11  19  
   !                             !  
   !                             1-- L  1  10  
   !                             !     
   5-----------------------------8----- L 36  44  
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