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