Consider the following premises. r_1 and q_5. u_2. Can we infer r_1 and u_2 from them? If possible, name the inference rules being used at each step.
 From r_1 and q_5 we can infer r_1 via simplification. Finally, from r_1, u_2 we can infer r_1 and u_2 via conjunction. Therefore, the answer is yes.