new F ∧ G → (C ∧ A → ((B → E) → (E → ((A ∨ B → C) → ((C → D) → (C → (D ∨ G ∧ D) ∧ (D ∧ G)))))))
intro
cases 0
intro
cases 3
intro
intro
intro
intro
intro
cases 0
cases 3
constructor
left
apply 9
exact 4
constructor
apply 9
exact 4
exact 2