What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x_18: S(x_18) -> T_3(x_18). forall x_18: T_3(x_18) -> S(x_18). forall x_18: S(x_18).
forall x_18: T_3(x_18). forall x_18: S(x_18) <-> T_3(x_18). forall x_18: T_3(x_18) <-> S(x_18).