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_17: ~P_15(x_17) or R_15(x_17). forall x_17: R_15(x_17) -> R_17(x_17). forall x_17: P_1(x_17) -> Q_1(x_17). forall x_17: P_15(x_17) or P_17(x_17). forall x_17: P_1(x_17). forall x_17: P_17(x_17) -> Q_17(x_17). exists x_17: Q_17(x_17) -> R_17(x_17).
forall x_17: Q_1(x_17) can be inferred via the universal modus ponens rule. exists x_17: P_17(x_17) -> R_17(x_17) can be inferred via the existential transitivity rule. forall x_17: P_17(x_17) or R_15(x_17) can be inferred via the universal resolution rule.