Given that P is a predicate, f, g are functions,…

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Given that P is a predicate, f, g are functions, a is a constant, and x, y, u, v, w are variables, we have
(1) P(g(f(x,y)), f(y, x), x ), and
(2) P(g(u), f(a, v), g(w)).

(a) Give a most general unifier for (1) and (2).
(b) Give a unifier that is NOT most general.

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