Consider the following premises. ~w_3 or s_3. w_3. Can we infer t_2 or s_3 from them? If possible, name the inference rules being used at each step.
 From w_3 we can infer w_3 or t_2 via addition. Finally, from w_3 or t_2, ~w_3 or s_3 we can infer t_2 or s_3 via resolution. Therefore, the answer is yes.