What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z: P_2(z) -> W(z). forall z: Q_1(z) -> P_2(z). exists z: W(z) -> Q_1(z).
forall z: Q_1(z) -> W(z). exists z: W(z) -> P_2(z). exists z: P_2(z) -> Q_1(z).