Consider the following premises. p or ~r_12. ~p_12 or r_12. p_12 or w_4. p <-> w_4. Can we infer p from them? If possible, name the inference rules being used at each step.
 From p_12 or w_4, ~p_12 or r_12 we can infer w_4 or r_12 via resolution. From p or ~r_12 we can infer r_12 -> p via rewriting. From p <-> w_4 we can infer w_4 -> p via biconditional elimination. Finally, from w_4 -> p, r_12 -> p, w_4 or r_12 we can infer p via disjunction elimination. Therefore, the answer is yes.