Consider the following premises. forall x_9: U(x_9) <-> S_9(x_9). U(h) -> S_9(h). Can we infer S_9(h) -> U(h) from them?
 From forall x_9: U(x_9) <-> S_9(x_9) we can infer U(h) <-> S_9(h). Finally, from U(h) <-> S_9(h) we can infer S_9(h) -> U(h). Therefore, the answer is yes.