Consider the following premises. ~S_17(i). p_6 -> q_6. S_17(i) -> W(i). q_6 -> W(i). forall x_17: W(x_17) -> S_17(x_17). Can we infer ~p_6 from them?
 From forall x_17: W(x_17) -> S_17(x_17) we can infer W(i) -> S_17(i). From S_17(i) -> W(i), W(i) -> S_17(i) we can infer S_17(i) <-> W(i). From p_6 -> q_6, q_6 -> W(i) we can infer p_6 -> W(i). From S_17(i) <-> W(i), ~S_17(i) we can infer ~W(i). Finally, from p_6 -> W(i), ~W(i) we can infer ~p_6. Therefore, the answer is yes.