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Give direct and indirect proofs of: a. p → (q → r), ¬s ∨ p, q...

Give direct and indirect proofs of:

a. p → (q → r), ¬s ∨ p, q ⇒ s → r.

b. p → q, q → r, ¬(p ∧ r), p ∨ r ⇒ r

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