Splits or splits and detachs edges on a polygon surface. 
         
         
          
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                  Cuts the surface of a ploygon. The face of a polygon is split, but the components are still connected and there is only one
                     set of vertices.
                   
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                  Seperates the polygon along the edges that were split. The componets of the polygon are detached and there are two or more
                     sets of vertices.