Consider the following premises. w_4 <-> q_3. R_10(a_10) <-> q_3. forall x_10: ~R_10(x_10). Can we infer ~w_4 from them? If possible, name the inference rules being used at each step.
 From forall x_10: ~R_10(x_10) we can infer ~R_10(a_10) via universal instantiation. From R_10(a_10) <-> q_3, ~R_10(a_10) we can infer ~q_3 via biconditional elimination. Finally, from w_4 <-> q_3, ~q_3 we can infer ~w_4 via biconditional elimination. Therefore, the answer is yes.