What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_9: ~P_9(x_9). forall x_9: ~Q_1(x_9). forall x_9: Q_1(x_9) or U(x_9). forall x_9: P_9(x_9) or W(x_9).
forall x_9: U(x_9). forall x_9: W(x_9).