Consider the following premises. For all x_11, x_11 will not work. For all x_11, x_11 will work or x_11 is an office clerk. There is at least one x_11 for which if x_11 were an office clerk, then x_11 is reading a book. Can we infer the following from them? There is at least one x_11 for which x_11 will read a book or x_11 will take a plane.
 From the fact that for all x_11, x_11 will work or x_11 is an office clerk, and that for all x_11, x_11 will not work we can infer that for all x_11, x_11 is an office clerk. From the fact that there is at least one x_11 for which if x_11 were an office clerk, then x_11 is reading a book, and that for all x_11, x_11 is an office clerk we can infer that there is at least one x_11 for which x_11 will read a book. Finally, from the fact that there is at least one x_11 for which x_11 will read a book we can infer that there is at least one x_11 for which x_11 will read a book or x_11 will take a plane. Therefore, the answer is yes.