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: exists x_9: P_9(x_9) or U_1(x_9). forall x_9: Q_5(x_9). forall x_9: ~P_9(x_9). forall x_9: P_5(x_9).
exists x_9: U_1(x_9) can be inferred via the existential disjunctive syllogism rule. forall x_9: Q_5(x_9) and P_5(x_9) can be inferred via the universal conjunction rule. forall x_9: P_5(x_9) and Q_5(x_9) can be inferred via the universal conjunction rule.