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	typedef HalfEdge_template<Iters> HalfEdge;
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	typedef HalfEdge_template<Iters> HalfEdge;
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	typedef Iters::HalfEdgeList HalfEdgeList;
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	typedef Iters::HalfEdgeList HalfEdgeList;
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	typedef Iters::HalfEdgeIter HalfEdgeIter;
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	typedef Iters::HalfEdgeIter HalfEdgeIter;
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	/// Returns true if the halfedge is a boundary halfedge.
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	bool is_boundary(HalfEdgeIter h);
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	bool is_boundary(HalfEdgeIter h);
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	/** Null Element for halfedge lists. This is used as the value of an iterator
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	/** Null Element for halfedge lists. This is used as the value of an iterator
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			that points to nothing. */
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			that points to nothing. */
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	extern HalfEdgeIter NULL_HALFEDGE_ITER;
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	extern HalfEdgeIter NULL_HALFEDGE_ITER;