What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z: ~Q_2(z). forall z: Q(z) -> Q_2(z). forall z: Q_2(z) <-> Q(z).
forall z: ~Q(z). forall z: Q_2(z) -> Q(z). forall z: Q(z) -> Q_2(z). forall z: ~Q(z).