For each pair of atomic sentences, give the most general unifier if it exists:
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$P(A,A,B)$, $P(x,y,z)$.
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$Q(y,G(A,B))$, $Q(G(x,x),y)$.
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${Older}({Father}(y),y)$, ${Older}({Father}(x),{Jerry})$.
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${Knows}({Father}(y),y)$, ${Knows}(x,x)$.
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