Consider the following premises. For all x_9, x_9 will read a book if and only if x_9 is a scientist. For all x_9, x_9 will not read a book. For all x_9, if x_9 reads a book, then x_9 is a scientist. Can we infer the following from them? For all x_9, x_9 is not a scientist.
 From the fact that for all x_9, x_9 will read a book if and only if x_9 is a scientist we can infer that for all x_9, if x_9 were a scientist, then x_9 is reading a book. From the fact that for all x_9, if x_9 were a scientist, then x_9 is reading a book, and that for all x_9, if x_9 reads a book, then x_9 is a scientist we can infer that for all x_9, x_9 is a scientist if and only if x_9 will read a book. From the fact that for all x_9, x_9 is a scientist if and only if x_9 will read a book we can infer that for all x_9, if x_9 were a scientist, then x_9 is reading a book. Finally, from the fact that for all x_9, if x_9 were a scientist, then x_9 is reading a book, and that for all x_9, x_9 will not read a book we can infer that for all x_9, x_9 is not a scientist. Therefore, the answer is yes.