What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z_4: Q(z_4) <-> U(z_4). forall z_4: Q(z_4) <-> U(z_4).
forall z_4: Q(z_4) -> U(z_4). forall z_4: Q(z_4) -> U(z_4). forall z_4: U(z_4) -> Q(z_4). forall z_4: U(z_4) -> Q(z_4).