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_12: P_12(x_12). exists x_12: ~Q_12(x_12). forall x_12: P_12(x_12) -> Q_12(x_12).
Since the premises are contradictory, we can infer anything from them.