What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? P_13(a_13). forall x_13: Q_9(x_13) -> R_9(x_13). forall x_13: P_9(x_13) -> Q_9(x_13). forall x_13: R_9(x_13) -> ~P_13(x_13).
exists x: P_13(x). forall x_13: P_9(x_13) -> R_9(x_13).