What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? forall x: U_3(x) <-> T(x). exists x: U_3(x) -> T(x). forall x: T(x) -> U_3(x).
exists x: U_3(x) <-> T(x). exists x: T(x) <-> U_3(x). forall x: U_3(x) -> T(x). forall x: T(x) -> U_3(x).