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74649a8 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | new C → ((B → F) → ((G → B) → (C ∧ G → (D ∨ E → (A ∧ D → ((E → D) → (F → G))))))) intro intro intro intro cases 3 intro intro cases 7 intro cases 3 cases 7 intro cases 3 cases 7 exact 5 |