Consider the following premises. r_4 -> ~p_2. s. p_2. Can we infer ~r_4 and s from them? If possible, name the inference rules being used at each step.
 From r_4 -> ~p_2, p_2 we can infer ~r_4 via modus tollens. Finally, from ~r_4, s we can infer ~r_4 and s via conjunction. Therefore, the answer is yes.