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urgent 4th question + 1is valid. Further, prove the validity of the sequent. 4. Let o = -(p + q) V-(q V r) ^ (p

urgent 4th question

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+ 1is valid. Further, prove the validity of the sequent. 4. Let o = -(p + q) V-(q V r) ^ (p V s). Express o as a propositional formula in Conjunctive Normal Form. [4M] 5. With reference to the formal definition of predicate logic. for the predicate formula

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