What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? exists x_12: P_2(x_12) -> ~Q_12(x_12). forall x_12: Q_12(x_12). forall x_12: P_2(x_12) or P_3(x_12).
exists x_12: ~P_2(x_12).