What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x: P_4(x) <-> T(x). forall x: P_4(x) or S(x). forall x: S(x) -> T(x). exists x: U(x) -> ~T(x).
forall x: P_4(x) -> T(x). forall x: T(x) -> P_4(x).