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) or S_3(z). forall z: P(z) <-> Q_2(z). forall z: Q_2(z) -> Q_1(z). forall z: ~Q_1(z).
forall z: ~Q_2(z). forall z: P(z) -> Q_2(z). forall z: Q_2(z) -> P(z).