new (G → H ∧ D) → ((H ∨ F → B) → (G → ((G → C) → ((E → F) → (E → (F → (B ∧ G ∨ C → (B → E) ∧ C ∨ B)))))))
intro
intro
intro
intro
intro
intro
intro
intro
left
constructor
intro
exact 5
apply 3
exact 2