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-  Store edges and vertices in a list.
 -  Polyhedral representation.
 -  Edge based matching.
 -  Problems with ambiguous (Fig. 36) and impossible
(Fig. 37) representations.
 -  Problems due to no solid matter of the object represented.
 -  Solid Models are better.
 
  
Fig. 36 An ambiguous wireframe
  
Fig. 37 The Devil's fork
 
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