What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x: R_2(x) <-> T(x). u <-> T(d). forall x: ~R_2(x).
u -> T(d). T(d) -> u. forall x: R_2(x) -> T(x). forall x: T(x) -> R_2(x). forall x: ~T(x).