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