Consider the following premises. forall x_14: P_14(x_14). forall x_14: P_14(x_14) -> Q_14(x_14). forall x_14: Q_14(x_14) -> Q_10(x_14). Can we infer Q_10(a_9) or u from them?
 From forall x_14: P_14(x_14) -> Q_14(x_14), forall x_14: P_14(x_14) we can infer forall x_14: Q_14(x_14). From forall x_14: Q_14(x_14) -> Q_10(x_14), forall x_14: Q_14(x_14) we can infer forall x_14: Q_10(x_14). From forall x_14: Q_10(x_14) we can infer Q_10(a_9). Finally, from Q_10(a_9) we can infer Q_10(a_9) or u. Therefore, the answer is yes.