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5e06520 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | new (A → B) → (G → (A ∨ G → (A ∨ F → (((B → E) → C) → (D → (B ∨ F) ∨ C))))) intro intro intro intro intro intro left cases 2 left apply 0 exact 6 cases 3 left apply 0 exact 8 right exact 9 |