What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z_1: S_4(z_1) -> U(z_1). forall z_1: S_4(z_1) or T(z_1). forall z_1: T(z_1) <-> U(z_1).
forall z_1: T(z_1) -> U(z_1). forall z_1: U(z_1) -> T(z_1).