new ((G → E) → K) → (H ∧ G → ((C ∨ E → D) → (A → (((G → F) → H) → (E → (D → J ∨ (K ∨ F)))))))
intro
intro
cases 1
intro
intro
intro
intro
intro
cases 1
right
left
apply 0
intro
cases 1
exact 7