new (D ∨ E → E) → ((E → B ∧ F) → ((E → F) → (F ∨ E → ((B ∨ A → C) → (C → (B → ((A ∧ A ∨ (D → F)) ∨ (B → B ∧ C ∨ D ∧ A)) ∨ C))))))
intro
intro
intro
intro
intro
intro
intro
left
left
right
intro
apply 2
apply 0
left
exact 7