What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists z: P(z) <-> U_1(z). forall z: S(z) or ~P(z).
forall z: P(z) -> S(z). exists z: P(z) -> U_1(z). exists z: U_1(z) -> P(z).