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_18: ~P_2(x_18). exists x_18: P_15(x_18) or Q_18(x_18). forall x_18: R_15(x_18) -> P_18(x_18). forall x_18: P_2(x_18) or W(x_18). forall x_18: P_18(x_18) or ~Q_18(x_18). forall x_18: ~P_15(x_18) or R_15(x_18).
forall x_18: W(x_18) can be inferred via the universal disjunctive syllogism rule. exists x_18: Q_18(x_18) or R_15(x_18) can be inferred via the existential resolution rule. forall x_18: Q_18(x_18) -> P_18(x_18) can be inferred via the universal rewriting rule.