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