What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z: P_4(z) -> Q(z). forall z: ~P_4(z). forall z: R_3(z) -> Q(z). exists z: Q(z) -> P_4(z).
exists z: ~Q(z). exists z: R_3(z) -> P_4(z). exists z: Q(z) <-> P_4(z). exists z: P_4(z) <-> Q(z).