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rev( Xs , Ys ) :- nonvar(Xs), !, rev( Xs, [] , Ys ) . rev( Xs , Ys ) :- nonvar(Ys), rev( Ys, [] , Xs ) . rev( [] , Ys , Ys ) . rev( [X|Xs] , Ts , Ys ) :- rev(Xs,[X|Ts],Ys).