What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Name the inference rule being used: forall x_9: P_5(x_9) <-> P_9(x_9). exists x_9: P_9(x_9). forall x_9: P_5(x_9) -> Q_5(x_9). forall x_9: ~Q_5(x_9).
Since the premises are contradictory, we can infer anything from them.