Consider the following premises. w_4 -> q_6. q_6 -> w_4. w_4 or q. ~q_6. Can we infer q from them? If possible, name the inference rules being used at each step.
 From w_4 -> q_6, q_6 -> w_4 we can infer w_4 <-> q_6 via biconditional introduction. From w_4 <-> q_6, ~q_6 we can infer ~w_4 via biconditional elimination. Finally, from w_4 or q, ~w_4 we can infer q via disjunctive syllogism. Therefore, the answer is yes.