What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_8: U(x_8) <-> S(x_8). forall x_8: S(x_8).
forall x_8: U(x_8) -> S(x_8). forall x_8: S(x_8) -> U(x_8).