File: 1.8d.txt

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gap-hap 1.70%2Bds-1
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gap> K:=ClosedSurface(1);;                
gap> KK:=DirectProduct(K,K);
Simplicial complex of dimension 4.

gap> cup:=CupProduct(KK);;                
gap> cup(2,2,[1,0,0,0,0,0],[0,1,0,0,0,0]);
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