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