Consider the following premises. forall x_11: P_11(x_11) <-> S(x_11). forall x_11: P_8(x_11) -> S(x_11). forall x_11: P_8(x_11) or P_11(x_11). exists x_11: R(x_11). forall x_11: S(x_11) -> U(x_11). Can we infer forall x_11: P_8(x_11) -> S(x_11) from them?
That is one of the premises. Therefore, the answer is yes.