Consider the following premises. forall x_7: W_4(x_7) or Q_2(x_7). forall x_7: Q_7(x_7) -> U(x_7). forall x_7: Q_2(x_7) -> Q_7(x_7). forall x_7: W(x_7) -> U(x_7). forall x_7: ~W_4(x_7) or W(x_7). Can we infer ~U(a_2) from them?
 From forall x_7: Q_2(x_7) -> Q_7(x_7), forall x_7: Q_7(x_7) -> U(x_7) we can infer forall x_7: Q_2(x_7) -> U(x_7). From forall x_7: W_4(x_7) or Q_2(x_7), forall x_7: ~W_4(x_7) or W(x_7) we can infer forall x_7: Q_2(x_7) or W(x_7). Finally, from forall x_7: Q_2(x_7) -> U(x_7), forall x_7: W(x_7) -> U(x_7), forall x_7: Q_2(x_7) or W(x_7) we can infer forall x_7: U(x_7), which contradicts ~U(a_2). Therefore, the answer is no.