new ((G → E) → G) → (E ∧ D → (E → (((F → G) → B) → ((A → B) → (E → ((H ∨ G → A) → (A → (E ∨ C) ∧ A ∨ (G ∨ (A ∨ D)))))))))
intro
intro
cases 1
intro
intro
intro
intro
intro
intro
cases 1
left
constructor
left
exact 2
exact 9