Consider the following premises. For all x_13, x_13 will take a plane or x_13 will read a book. For all x_13, if x_13 takes a plane, then x_13 is a cashier. For all x_13, x_13 is not a cashier. For all x_13, if x_13 were a cashier, then x_13 is taking a plane. Can we infer the following from them? There is at least one x_13 for which neither x_13 will read a book nor x_13 is a police officer.
 From the fact that for all x_13, if x_13 were a cashier, then x_13 is taking a plane, and that for all x_13, if x_13 takes a plane, then x_13 is a cashier we can infer that for all x_13, x_13 is a cashier if and only if x_13 will take a plane. From the fact that for all x_13, x_13 is a cashier if and only if x_13 will take a plane we can infer that for all x_13, if x_13 takes a plane, then x_13 is a cashier. From the fact that for all x_13, if x_13 takes a plane, then x_13 is a cashier, and that for all x_13, x_13 is not a cashier we can infer that for all x_13, x_13 will not take a plane. From the fact that for all x_13, x_13 will take a plane or x_13 will read a book, and that for all x_13, x_13 will not take a plane we can infer that for all x_13, x_13 will read a book. Finally, from the fact that for all x_13, x_13 will read a book we can infer that for all x_13, x_13 will read a book or x_13 is a police officer, which contradicts that There is at least one x_13 for which neither x_13 will read a book nor x_13 is a police officer. Therefore, the answer is no.