Consider the following premises. forall x_6: R_6(x_6) or S_6(x_6). ~S_6(a_6) or q_4. ~R_6(a_6) or u_1. Can we infer u_1 or q_4 from them?
 From forall x_6: R_6(x_6) or S_6(x_6) we can infer R_6(a_6) or S_6(a_6). From R_6(a_6) or S_6(a_6), ~R_6(a_6) or u_1 we can infer S_6(a_6) or u_1. Finally, from S_6(a_6) or u_1, ~S_6(a_6) or q_4 we can infer u_1 or q_4. Therefore, the answer is yes.