Consider the following premises. For all x_7, x_7 is not an artist. For all x_7, x_7 is a police officer or x_7 is not an artist. For all x_7, x_7 is an artist or x_7 is not a police officer. Can we infer the following from them? There is at least one x_7 for which x_7 is a police officer.
 From the fact that for all x_7, x_7 is an artist or x_7 is not a police officer we can infer that for all x_7, if x_7 were a police officer, then x_7 is an artist. From the fact that for all x_7, x_7 is a police officer or x_7 is not an artist we can infer that for all x_7, if x_7 were an artist, then x_7 is a police officer. From the fact that for all x_7, if x_7 were a police officer, then x_7 is an artist, and that for all x_7, if x_7 were an artist, then x_7 is a police officer we can infer that for all x_7, x_7 is a police officer if and only if x_7 is an artist. Finally, from the fact that for all x_7, x_7 is a police officer if and only if x_7 is an artist, and that for all x_7, x_7 is not an artist we can infer that for all x_7, x_7 is not a police officer, which contradicts that There is at least one x_7 for which x_7 is a police officer. Therefore, the answer is no.