Consider the following premises. For all x_16, x_16 will read a book if and only if x_16 will work. For all x_16, if x_16 reads a book, then x_16 is an office clerk. There is at least one x_16 for which x_16 will sleep. For all x_16, if x_16 were an office clerk, then x_16 is not sleeping. Can we infer the following from them? There is at least one x_16 for which x_16 will not work.
 From the fact that for all x_16, x_16 will read a book if and only if x_16 will work we can infer that for all x_16, if x_16 works, then x_16 is reading a book. From the fact that for all x_16, if x_16 works, then x_16 is reading a book, and that for all x_16, if x_16 reads a book, then x_16 is an office clerk we can infer that for all x_16, if x_16 works, then x_16 is an office clerk. From the fact that for all x_16, if x_16 were an office clerk, then x_16 is not sleeping, and that there is at least one x_16 for which x_16 will sleep we can infer that there is at least one x_16 for which x_16 is not an office clerk. Finally, from the fact that for all x_16, if x_16 works, then x_16 is an office clerk, and that there is at least one x_16 for which x_16 is not an office clerk we can infer that there is at least one x_16 for which x_16 will not work. Therefore, the answer is yes.