Please explained using the inference rules and also show all steps. In each part below, give a formal proof that the sentence given is valid or else provided an interpretation in which the sentence is false.
(a) ∀xP' (x) → ∃x[P(x) → Q'(x)].
(b) ∃x[P(x) → Q'(x)] → ∃xP' (x).
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