Consider the following premises. w -> p_6. p_6 or R_17(a_17). forall x_17: R_17(x_17) -> S_17(x_17). p_6 -> w. S_17(a_17) -> w. Can we infer w from them?
 From forall x_17: R_17(x_17) -> S_17(x_17) we can infer R_17(a_17) -> S_17(a_17). From R_17(a_17) -> S_17(a_17), S_17(a_17) -> w we can infer R_17(a_17) -> w. From p_6 -> w, w -> p_6 we can infer p_6 <-> w. From p_6 <-> w we can infer p_6 -> w. Finally, from p_6 -> w, R_17(a_17) -> w, p_6 or R_17(a_17) we can infer w. Therefore, the answer is yes.