What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists x_4: P_3(x_4) -> ~Q(x_4). forall x_4: U(x_4) or Q_4(x_4). forall x_4: U(x_4) -> Q(x_4). forall x_4: Q_4(x_4) -> Q(x_4).
forall x_4: Q(x_4).