What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z: Q(z) -> Q_1(z). Q_1(h_2) or t. forall z: Q_1(z) -> Q(z). t -> Q(h_2).
forall z: Q(z) <-> Q_1(z). forall z: Q_1(z) <-> Q(z).