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69
if (s->isCompact() && (! s->hasRealBoundary()) &&
70
70
(! s->isVertexLinking())) {
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71
chi = s->getEulerCharacteristic();
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73
// It's a non-trivial 2-sphere!
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// Clone the surface for our return value.
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75
NNormalSurface* ans = (chi == 1 ? s->doubleSurface() :