Consider the following premises. S_7(a_7) <-> q_4. ~q_4. forall x_7: W(x_7) <-> S_7(x_7). Can we infer W(a_7) from them?
 From forall x_7: W(x_7) <-> S_7(x_7) we can infer W(a_7) <-> S_7(a_7). From S_7(a_7) <-> q_4, ~q_4 we can infer ~S_7(a_7). Finally, from W(a_7) <-> S_7(a_7), ~S_7(a_7) we can infer ~W(a_7), which contradicts W(a_7). Therefore, the answer is no.