Consider the following premises. For all x_2, x_2 is bored if and only if x_2 is a writer. Can we infer the following from them? If we can, name the inference rule being used: If William were a writer, then William is bored.
 From the fact that for all x_2, x_2 is bored if and only if x_2 is a writer we can infer that William is bored if and only if William is a writer via universal instantiation. Finally, from the fact that William is bored if and only if William is a writer we can infer that if William were a writer, then William is bored via biconditional elimination. Therefore, the answer is yes.