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Davi
a) ~(p ∨ q) ∧ p b) p ∧ q → (r ↔ q) c) (~p → q) ∨ (r → ~p) d) ~((p ↔ ~q) → r ∧ ~q) e) ((p ∨ q) ∨ (r → (p → r)))
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