What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall z_3: Q(z_3). exists z_3: W(z_3) -> R_4(z_3). forall z_3: U_4(z_3) -> R_4(z_3). forall z_3: W(z_3) or U_4(z_3).
exists z_3: R_4(z_3).