Consider the following premises. forall x_11: Q_11(x_11) -> Q_8(x_11). forall x_11: U(x_11) <-> Q_8(x_11). forall x_11: U(x_11) <-> Q_11(x_11). Can we infer forall x_11: U(x_11) <-> Q_11(x_11) from them?
That is one of the premises. Therefore, the answer is yes.