new ((G → H) → C) → (I → (A → ((I ∨ G → F) → (G ∧ J → (((H → J) → B) → ((I → E ∧ H) → ((C → G) → (C → J) ∧ ((G ∧ B → D ∧ J) ∨ (I → A)))))))))
intro
intro
intro
intro
intro
cases 4
intro
intro
intro
cases 4
constructor
intro
cases 4
exact 6
right
intro
cases 4
exact 2