Consider the following premises. forall z: U_3(z) -> T(z). forall z: S_4(z) -> T_3(z). forall z: T(z) <-> S_4(z). Can we infer forall z: U_3(z) -> T_3(z) from them?
 From forall z: T(z) <-> S_4(z) we can infer forall z: T(z) -> S_4(z). From forall z: U_3(z) -> T(z), forall z: T(z) -> S_4(z) we can infer forall z: U_3(z) -> S_4(z). Finally, from forall z: U_3(z) -> S_4(z), forall z: S_4(z) -> T_3(z) we can infer forall z: U_3(z) -> T_3(z). Therefore, the answer is yes.