Determine whether each of the following sets is unifiable. If yes, obtain a most general unifier. w = {P(A,B,B),P(x, y, z)} w = {Q(y, G(A,B)), Q(G(x, x),y)} {Older(Father(y),y),Older(Father(x),John)} w = {Knows(Father(y),y), Knows(x, x)} %3D W =

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