Consider the following premises. exists x_17: ~Q_17(x_17). forall x_17: P_17(x_17) or Q_5(x_17). forall x_17: U(x_17) -> ~Q_5(x_17). forall x_17: P_17(x_17) <-> Q_17(x_17). Can we infer forall x_17: P_17(x_17) or Q_5(x_17) from them?
That is one of the premises. Therefore, the answer is yes.