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Prove the validity of the following sequents: a) (p^q) Ar, sit tq1s b) p1q tq1p c) r, p (r q) Fp (q4r) d) (p q)(p

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Prove the validity of the following sequents: a) (p^q) Ar, sit tq1s b) p1q tq1p c) r, p (r q) Fp (q4r) d) (p q)(p r) Fpq1r e) p 9,5 EpVsq1t f) (s p) V (t q) + (s q) v (t p)

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