Using the transformation rules of system P, prove the following argument to be valid

Q1:1. (A ⊃ B) ⊃ C Premise2. (D ⊃ C) ⊃ (~E V ~F) Premise3. ~(~B V ~E) Premise——————————————–/ :. ~FQ2:1. (~A ≡ ~C) Premise2. ~(B ⊃ C) Premise——————————-/ :. ~Z ⊃ ~AQ3:1. A ⊃ ~(~B ⊃ C) Premise2. (X ⊃ ~Y) ≡ ~Z Premise3. ~Y V C Premise————————————–/ :. A ⊃ ~ZQ4:1. ~(P ≡ Q) Premise———————————–/ :. ~Q ≡ PQ5:P ≡ [P V (Q & ~Q)]
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