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An ArrangementDcel_2 is (!) a refinement of the PlanarMapDcel_2 concept . However, it is very similiar. The difference in requirements is that the Halfedge type should a model of the more refined concept ArrangementDcelHalfedge_2.
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    The halfedge type. Should be a model of the
       ArrangementDcelHalfedge_2 concept.
 
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