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