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    inline HalfEdgeWalker HalfEdgeWalker::circulate_vertex_ccw() const
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    inline HalfEdgeWalker HalfEdgeWalker::circulate_vertex_ccw() const
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    { return HalfEdgeWalker(*ck, ck->opp(ck->prev(current)), last, counter + 1); }
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    { return HalfEdgeWalker(*ck, ck->opp(ck->prev(current)), last, counter + 1); }
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    inline HalfEdgeWalker HalfEdgeWalker::circulate_face_cw() const
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    inline HalfEdgeWalker HalfEdgeWalker::circulate_face_cw() const
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    { return HalfEdgeWalker(*ck, ck->next(current), last, counter + 1); }
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    { return HalfEdgeWalker(*ck, ck->prev(current), last, counter + 1); }
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    inline HalfEdgeWalker HalfEdgeWalker::circulate_face_ccw() const
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    inline HalfEdgeWalker HalfEdgeWalker::circulate_face_ccw() const
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    { return HalfEdgeWalker(*ck, ck->prev(current), last, counter + 1); }
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    { return HalfEdgeWalker(*ck, ck->next(current), last, counter + 1); }
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    inline bool HalfEdgeWalker::full_circle() const
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    inline bool HalfEdgeWalker::full_circle() const
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    { return (counter > 0 && current == last) ? true : false; }
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    { return (counter > 0 && current == last) ? true : false; }
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    inline int HalfEdgeWalker::no_steps() const
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    inline int HalfEdgeWalker::no_steps() const