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2 Propositional Logic Task 2.1 (Written, 9 points). Say whether each of the following is a tautology, contradiction or contingency. If it's a contingency, give a state where the proposition is true and a state where it's false. a) (P ( QR)) + (( PQ) + R) b) ( PQ) (-Q -P) ) -PAQe-QAP