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[ChaoM <>]

Hello all:
     I meet a problem : that convert polyhedron to Nef_polyhedron, there is
an error about that the Nef is_simple()!
    So I want to know how to judge a Nef is simple? And what is the standard
of the is_simple?
If you can show me a small but detail example , I am  very appreciated! 


THanks



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