Consider the following premises. w and q_10. q <-> w. Can we infer q from them? If possible, name the inference rules being used at each step.
 From w and q_10 we can infer w via simplification. From q <-> w we can infer w -> q via biconditional elimination. Finally, from w -> q, w we can infer q via modus ponens. Therefore, the answer is yes.