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(x_12) -> ~R_9(x_12). forall x_12: R_12(x_12) -> R_9(x_12). forall x_12: P_12(x_12) or Q_12(x_12). exists x_12: ~P_12(x_12) or R_12(x_12). forall x_12: Q_12(x_12) -> R_9(x_12).
exists x_12: Q_12(x_12) or R_12(x_12) can be inferred via the existential resolution rule.