new C → (((G → D) → D) → ((B → C ∧ C) → (E ∧ G → ((C ∧ (B ∨ C) → G ∧ E) → (G → (F → (G ∧ H → (A → A ∨ C))))))))
intro
intro
intro
intro
cases 3
intro
intro
intro
intro
cases 9
cases 3
cases 9
intro
cases 3
cases 9
left
exact 16