/usr/share/gap/pkg/Polycyclic/gap/matrep/matrep.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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##
## This defines the operation for computing (lower) unitriangular
## matrix representations for finitely generated torsion-free nilpotent
## groups.
##
#G UnitriangularMatrixRepresentation . . . . . . . . . . . . . . . . . . . .
##
DeclareOperation( "UnitriangularMatrixRepresentation", [IsGroup] );
DeclareProperty( "IsHomomorphismIntoMatrixGroup",
IsGroupGeneralMappingByImages );
DeclareGlobalFunction( "IsMatrixRepresentation" );
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