Consider the following premises. forall x_11: R_11(x_11) and S_11(x_11). t_3. Can we infer ~R_11(c_4) from them? If possible, name the inference rules being used at each step.
 From forall x_11: R_11(x_11) and S_11(x_11) we can infer R_11(c_4) and S_11(c_4) via universal instantiation. Finally, from R_11(c_4) and S_11(c_4) we can infer R_11(c_4) via simplification, which contradicts ~R_11(c_4). Therefore, the answer is no.