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_2(x_9). exists x_9: P_9(x_9) or Q_9(x_9). forall x_9: P_9(x_9) -> P(x_9). forall x_9: Q_9(x_9) -> P(x_9).
exists x_9: P(x_9).