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5e06520 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | new ((B → A) → D) → (C ∧ B → (D ∧ C → ((D ∨ B → ((((D → C) → (B → B)) → A) → C)) → B ∧ D))) intro intro cases 1 intro cases 4 cases 1 cases 4 intro cases 1 cases 4 constructor exact 3 exact 5 |