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The vertex base used by Triangulation_hierarchy_3 must provide access to two vertex handles for linking between the levels of the hierarchy.
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| Returns the Vertex_handle pointing to the level above. |
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| Returns the Vertex_handle pointing to the level below. |
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| Sets the Vertex_handle pointing to the level above to v. |
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| Sets the Vertex_handle pointing to the level below to v. |
CGAL::Triangulation_hierarchy_vertex_base_3