Standard_Boolean ShapeAnalysis_Wire::CheckConnected (const Standard_Integer num, const Standard_Real 
prec)
{
  ...
  ShapeAnalysis_Edge sae;
  TopoDS_Vertex V1 = sae.LastVertex (E1);
  TopoDS_Vertex V2 = sae.FirstVertex (E2);
  ...
  if (V1.IsSame(V2)) return Standard_False; // strange to return FALSE
  ...
}