/usr/share/gap/pkg/Polycyclic/gap/basic/basic.gd is in gap-polycyclic 2.11-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#W basic.gd Polycyc Bettina Eick
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#F The collector
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DeclareOperation( "Collector", [ IsObject ] );
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#F Exponent vectors.
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DeclareGlobalFunction( "ReducedByIgs" );
DeclareGlobalFunction( "ExponentsByIgs");
DeclareGlobalFunction( "ExponentsByPcp");
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#F Subgroup series of a pcp group.
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DeclareGlobalFunction( "PcpSeries" );
DeclareGlobalFunction( "RefinedDerivedSeries");
DeclareGlobalFunction( "RefinedDerivedSeriesDown");
DeclareGlobalFunction( "TorsionByPolyEFSeries");
DeclareGlobalFunction( "ModuloSeries" );
DeclareGlobalFunction( "EfaSeriesParent" );
DeclareAttribute( "EfaSeries", IsPcpGroup );
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#F Their corresponding pcp sequences.
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DeclareGlobalFunction( "PcpsBySeries");
DeclareGlobalFunction( "ModuloSeriesPcps" );
DeclareGlobalFunction( "ReducedEfaSeriesPcps" );
DeclareGlobalFunction( "ExtendedSeriesPcps" );
DeclareGlobalFunction( "IsEfaFactorPcp" );
DeclareAttribute( "PcpsOfEfaSeries", IsPcpGroup );
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#F Isomorphisms and natural homomorphisms
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DeclareAttribute( "IsomorphismPcpGroup", IsGroup );
DeclareAttribute( "PcpGroupByEfaSeries", IsGroup );
DeclareGlobalFunction( "NaturalHomomorphismByPcp" );
DeclareOperation( "NaturalHomomorphism", [IsPcpGroup, IsPcpGroup] );
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