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