Consider the following premises. forall y_1: T(y_1) -> U(y_1). forall y_1: S(y_1) -> T(y_1). forall y_1: U(y_1) -> U_4(y_1). forall y_1: ~U_4(y_1). Can we infer forall y_1: S(y_1) -> T(y_1) from them?
That is one of the premises. Therefore, the answer is yes.