What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x: R_1(x) -> T(x). forall x: U_4(x). forall x: T(x) -> ~U_4(x). forall x: T(x) -> R_1(x).
forall x: ~T(x). forall x: R_1(x) <-> T(x). forall x: T(x) <-> R_1(x).