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zip( [] , [] , [] ) . zip( [] , [Y|Ys] , [nil:Y|Zs] ) :- zip([],Ys,Zs) . zip( [X|Xs] , [] , [X:nil|Zs] ) :- zip(Xs,[],Zs) . zip( [X|Xs] , [Y|Ys] , [X:Y|Zs] ) :- zip(Xs,Ys,Zs) .