GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
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## OrbifoldTriangulation.gd SCO package Simon Goertzen
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## Copyright 2007-2008 Lehrstuhl B für Mathematik, RWTH Aachen
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## Declaration stuff for Orbifold Triangulations.
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DeclareCategory( "IsOrbifoldTriangulation",
IsAttributeStoringRep );
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DeclareGlobalFunction( "OrbifoldTriangulation" );
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DeclareOperation( "Vertices",
[ IsOrbifoldTriangulation ] );
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DeclareOperation( "Simplices",
[ IsOrbifoldTriangulation ] );
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DeclareOperation( "Isotropy",
[ IsOrbifoldTriangulation ] );
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DeclareOperation( "Mu",
[ IsOrbifoldTriangulation ] );
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DeclareOperation( "MuData",
[ IsOrbifoldTriangulation ] );
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DeclareOperation( "InfoString",
[ IsOrbifoldTriangulation ] );