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GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it

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#(C) 2009 Graham Ellis

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DeclareCategory("IsHapCommutativeDiagram",IsObject);

DeclareRepresentation(  "IsHapCommutativeDiagramRep",
                        IsComponentObjectRep,
                        ["objects",
			 "arrows",
                         "properties"]);

HapCommutativeDiagramFamily:=NewFamily( "HapCommutativeDiagramFamily",
                                 IsHapCommutativeDiagram,
                                 IsHapCommutativeDiagram);

HapCommutativeDiagram:=NewType(HapCommutativeDiagramFamily,IsHapCommutativeDiagramRep);


InstallMethod( ViewObj,
"for HapCommutativeDiagram",
[IsHapCommutativeDiagram],
function(T)
Print("Commutative diagram with ",Size(T!.objects)," objects and ",Size(T!.arrows)," arrows.\n"     );
end);

InstallMethod( PrintObj,
"for HapCommutativeDiagram",
[IsHapCommutativeDiagram],
function(T)
Print("Commutative diagram.\n");
end);


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