new ((E → D) → A) → (B → ((A → E) → ((C → D ∧ E) → (D ∨ B → (F ∨ (F ∨ A)) ∨ ((A → B) ∨ (E → F ∧ (D ∧ D)))))))
intro
intro
intro
intro
intro
right
left
intro
exact 1