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