What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_9: ~T_1(x_9). forall x_9: T_1(x_9) -> S(x_9). forall x_9: T_1(x_9) <-> S(x_9).
forall x_9: T_1(x_9) -> S(x_9). forall x_9: S(x_9) -> T_1(x_9). forall x_9: ~S(x_9).