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is the following expression a tautology? ((p -> q)(q -> r)) -> (p -> r) note you can replace (p v q)(r v s) by

is the following expression a tautology?

((p -> q)(q -> r)) -> (p -> r)

note you can replace (p v q)(r v s) by pr v ps v qr v qs or by q(s v r) v (r v s)p

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