/usr/share/gap/pkg/Polycyclic/gap/pcpgrp/pcpgrp.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 pcpgrp.gd Polycyc Bettina Eick
##
# fitting.gi
DeclareAttribute( "SemiSimpleEfaSeries", IsPcpGroup );
DeclareAttribute( "FCCentre", IsGroup );
DeclareGlobalFunction( "NilpotentByAbelianByFiniteSeries" );
DeclareProperty( "IsNilpotentByFinite", IsGroup );
InstallTrueMethod( IsNilpotentByFinite, IsNilpotentGroup );
InstallTrueMethod( IsNilpotentByFinite, IsGroup and IsFinite );
# maxsub.gi
KeyDependentOperation( "MaximalSubgroupClassesByIndex",
IsGroup, IsPosInt, ReturnTrue );
# findex/nindex.gi
KeyDependentOperation( "LowIndexSubgroupClasses",
IsGroup, IsPosInt, ReturnTrue );
KeyDependentOperation( "LowIndexNormalSubgroups",
IsGroup, IsPosInt, ReturnTrue );
DeclareGlobalFunction( "NilpotentByAbelianNormalSubgroup" );
# polyz.gi
DeclareGlobalFunction( "PolyZNormalSubgroup" );
# schur and tensor
DeclareAttribute( "SchurExtension", IsGroup );
DeclareAttribute( "SchurExtensionEpimorphism", IsGroup );
DeclareGlobalFunction("EvalConsistency");
DeclareGlobalFunction("QuotientBySystem");
DeclareAttribute( "NonAbelianTensorSquare", IsGroup );
DeclareAttribute( "NonAbelianExteriorSquare", IsGroup );
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