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