Consider the following premises. forall x: Q(x) <-> T_4(x). forall x: Q(x) or ~T_4(x). Can we infer forall x: T_4(x) -> Q(x) from them?
 From forall x: Q(x) <-> T_4(x) we can infer forall x: Q(x) -> T_4(x). Finally, from forall x: Q(x) or ~T_4(x) we can infer forall x: T_4(x) -> Q(x). Therefore, the answer is yes.