Consider the following premises. ~w_4. p_14 or s. p_14 <-> w_4. ~q_4 or t_4. Can we infer s or t_4 from them? If possible, name the inference rules being used at each step.
 From p_14 <-> w_4, ~w_4 we can infer ~p_14 via biconditional elimination. From ~p_14 we can infer ~p_14 or q_4 via addition. From ~p_14 or q_4, p_14 or s we can infer q_4 or s via resolution. Finally, from q_4 or s, ~q_4 or t_4 we can infer s or t_4 via resolution. Therefore, the answer is yes.