What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x: S_1(x) or Q_2(x). forall x: ~T(x). forall x: T(x) <-> S_1(x).
forall x: T(x) -> S_1(x). forall x: S_1(x) -> T(x). forall x: ~S_1(x).