Natural Deduction (8 points each): Provide proofs for thefollowing arguments. You mayuse both primitive and derived rules of inference.
20. (∀x)~Rx(∃z)[Pz ⊃ (∀y)(Py ⊃ Ry)]∴~(∀x)Px
Natural Deduction (8 points each): Provide proofs for the following arguments. You may use both primitive and derived ru
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