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_9: S_1(x_9) -> P(x_9). forall x_9: S_1(x_9) <-> W_1(x_9). forall x_9: P(x_9) -> S_1(x_9). forall x_9: W_1(x_9) -> Q_5(x_9). forall x_9: ~Q_5(x_9).
forall x_9: ~W_1(x_9) can be inferred via the universal modus tollens rule. forall x_9: S_1(x_9) <-> P(x_9) can be inferred via the universal biconditional introduction rule. forall x_9: P(x_9) <-> S_1(x_9) can be inferred via the universal biconditional introduction rule. forall x_9: S_1(x_9) -> W_1(x_9) can be inferred via the universal biconditional elimination rule. forall x_9: W_1(x_9) -> S_1(x_9) can be inferred via the universal biconditional elimination rule.