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b7c7484 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | new B ∨ A → (A → (B → ((A → B) → ((((B ∨ C) ∧ (A ∨ B)) ∧ A ∨ (D ∨ B ∧ A)) ∨ B) ∧ B))) intro intro intro intro constructor left left constructor constructor left exact 2 left exact 1 exact 1 exact 2 |