Consider the following premises. w <-> U(a_8). forall x_8: U(x_8) or S_8(x_8). ~w. Can we infer ~S_8(a_8) from them?
 From forall x_8: U(x_8) or S_8(x_8) we can infer U(a_8) or S_8(a_8). From w <-> U(a_8), ~w we can infer ~U(a_8). Finally, from U(a_8) or S_8(a_8), ~U(a_8) we can infer S_8(a_8), which contradicts ~S_8(a_8). Therefore, the answer is no.