Consider the following premises. For all x_10, if x_10 works, then x_10 is reading a book. For all x_11, x_11 will work. For all x_10, if x_10 reads a book, then x_10 is working. Can we infer the following from them? If we can, name the inference rule being used: Robert is reading a book.
 From the fact that for all x_11, x_11 will work we can infer that Robert is working via universal instantiation. From the fact that for all x_10, if x_10 works, then x_10 is reading a book, and that for all x_10, if x_10 reads a book, then x_10 is working we can infer that for all x_10, x_10 will work if and only if x_10 will read a book via universal biconditional introduction. From the fact that for all x_10, x_10 will work if and only if x_10 will read a book we can infer that for all x_10, if x_10 works, then x_10 is reading a book via universal biconditional elimination. From the fact that for all x_10, if x_10 works, then x_10 is reading a book we can infer that if Robert works, then Robert is reading a book via universal instantiation. Finally, from the fact that if Robert works, then Robert is reading a book, and that Robert is working we can infer that Robert is reading a book via modus ponens. Therefore, the answer is yes.