new G ∨ A → (((F → C) → E) → ((E ∨ D → D) → (C ∧ D → ((G → C ∧ G) → (H → (E → (C ∨ G → (C → H) ∨ (E ∧ (H → C) ∨ (B ∨ C)) ∧ A)))))))
intro
intro
intro
intro
cases 3
intro
intro
intro
intro
cases 3
left
intro
cases 3
exact 7