new ((B → C) → G) → ((I ∧ C → A) ∧ I → (G ∧ A → (I ∨ C → (C ∨ I → (E → ((A → C) → (J ∧ G → G)))))))
intro
intro
cases 1
intro
cases 4
intro
intro
intro
intro
intro
cases 11
cases 1
cases 4
cases 11
exact 5