Consider the following premises. For all x_8, x_8 is a soldier if and only if x_8 will read a book. For all x_8, x_8 is sad. For all x_8, if x_8 reads a book, then x_8 is not sad. For all x_8, if x_8 reads a book, then x_8 is a soldier. Can we infer the following from them? For all x_8, x_8 is not a soldier.
 From the fact that for all x_8, x_8 is a soldier if and only if x_8 will read a book we can infer that for all x_8, if x_8 were a soldier, then x_8 is reading a book. From the fact that for all x_8, if x_8 reads a book, then x_8 is not sad, and that for all x_8, x_8 is sad we can infer that for all x_8, x_8 will not read a book. From the fact that for all x_8, if x_8 reads a book, then x_8 is a soldier, and that for all x_8, if x_8 were a soldier, then x_8 is reading a book we can infer that for all x_8, x_8 will read a book if and only if x_8 is a soldier. Finally, from the fact that for all x_8, x_8 will read a book if and only if x_8 is a soldier, and that for all x_8, x_8 will not read a book we can infer that for all x_8, x_8 is not a soldier. Therefore, the answer is yes.