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[freckles <>]

Thanks for the reply. I was collapsing the edges by using join_facet and
join_vertex. I realised that this was because the polyhedron became invalid
after some collapses. i.e. The degree of a vertex after collapsing is 2,
which is impossible for a closed triangle mesh, however CGAL does not throw
any exceptions saying that the mesh has become non-manifold, which was
weird. 

After checking that the collapses will result in a manifold mesh, it works
fine.  

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