What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z: ~P(z). forall z: P(z) -> P_3(z). exists z: P_3(z) -> P(z). forall z: P(z) -> P_3(z).
exists z: ~P_3(z). exists z: P_3(z) <-> P(z). exists z: P_3(z) <-> P(z). exists z: P(z) <-> P_3(z). exists z: P(z) <-> P_3(z).