What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_18: P_18(x_18) -> Q_1(x_18). forall x_18: Q_1(x_18) -> U_3(x_18). exists x_18: P_18(x_18) or Q_18(x_18). forall x_18: Q_18(x_18) -> Q_1(x_18).
forall x_18: P_18(x_18) -> U_3(x_18). forall x_18: Q_18(x_18) -> U_3(x_18). exists x_18: Q_1(x_18).