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_13: Q_13(x_13) -> P_9(x_13). forall x_13: ~Q_9(x_13). forall x_13: P_9(x_13) -> Q_9(x_13). forall x_13: R_3(x_13) -> Q_13(x_13). forall x_13: Q_13(x_13) -> R_3(x_13).
forall x_13: ~P_9(x_13) can be inferred via the universal modus tollens rule. forall x_13: Q_13(x_13) -> Q_9(x_13) can be inferred via the universal transitivity rule. forall x_13: R_3(x_13) -> P_9(x_13) can be inferred via the universal transitivity rule. forall x_13: R_3(x_13) <-> Q_13(x_13) can be inferred via the universal biconditional introduction rule. forall x_13: Q_13(x_13) <-> R_3(x_13) can be inferred via the universal biconditional introduction rule.