Consider the following premises. W_3(a_21) <-> p. forall x_21: W_3(x_21) <-> S_21(x_21). ~p. Can we infer ~S_21(a_21) or w from them?
 From forall x_21: W_3(x_21) <-> S_21(x_21) we can infer W_3(a_21) <-> S_21(a_21). From W_3(a_21) <-> p we can infer W_3(a_21) -> p. From W_3(a_21) -> p, ~p we can infer ~W_3(a_21). From W_3(a_21) <-> S_21(a_21), ~W_3(a_21) we can infer ~S_21(a_21). Finally, from ~S_21(a_21) we can infer ~S_21(a_21) or w. Therefore, the answer is yes.