Consider the following premises. For all x_16, x_16 is an electrician if and only if x_16 is a politician. If Barbara reads a book, then James is not a politician. If William were poor, then James is a politician. James is an electrician or William is poor. Can we infer the following from them? If we can, name the inference rule being used: Barbara is not reading a book.
 From the fact that for all x_16, x_16 is an electrician if and only if x_16 is a politician we can infer that James is an electrician if and only if James is a politician via universal instantiation. From the fact that James is an electrician if and only if James is a politician we can infer that if James were an electrician, then James is a politician via biconditional elimination. From the fact that if James were an electrician, then James is a politician, that if William were poor, then James is a politician, and that James is an electrician or William is poor we can infer that James is a politician via disjunction elimination. Finally, from the fact that if Barbara reads a book, then James is not a politician, and that James is a politician we can infer that Barbara is not reading a book via modus tollens. Therefore, the answer is yes.