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217

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1
+2  A: 

Are you using a regular rather than a Delaunay triangulation?

You are using the following, right?

CGAL::Delaunay_triangulation_2<Traits,Tds>

http://www.cgal.org/Manual/3.4/doc_html/cgal_manual/Triangulation_2_ref/Class_Delaunay_triangulation_2.html#Cross_link_anchor_1152

nsanders