GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
DeclareGlobalFunction("IsPnormal");
DeclareGlobalFunction("TorsionSubcomplex");
DeclareGlobalFunction("VisualizeTorsionSkeleton");
DeclareGlobalFunction("ReduceTorsionSubcomplex");
DeclareGlobalFunction("DisplayAvailableCellComplexes");