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- (p ⇒ r) ∨ (q⇒r) ├ (p ∧ q) ⇒ r
- 1 (p ⇒ r) ∨ (q⇒r) Assump o
- 2 (p ∧ q) ├ r
- 2.1 p ∧ q Assump 2
- 2.2 r V E 1,2
- 3 (p ∧ q) ⇒ r ⇒I 2
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