What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_8: Q_9(x_8). forall y_1: S(y_1) -> Q_9(y_1). forall y_1: Q_9(y_1) -> S(y_1).
forall y_1: S(y_1) <-> Q_9(y_1). forall y_1: Q_9(y_1) <-> S(y_1).