23. p ∧ ¬q 24. (¬p ∨ ¬q) ∨ p 25. (p ∨ q) ∧ ¬p 26. (p ∧ q) ∧ ¬p 27. (p ∧ q) ∨ (¬p ∨ q) 28. ¬(p ∧ q) ∨ (r ∧ ¬p) 29. (p ∨ q) ∧ (¬p ∨ q) ∧ (p ∨ ¬q) ∧ (¬p ∨ ¬q) 30. ¬(p ∧ q) ∨ (¬q ∨

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