Consider the following premises. William is sleeping. For all x_9, x_9 is a police officer if and only if x_9 will sleep. Can we infer the following from them? William is not a police officer.
 From the fact that for all x_9, x_9 is a police officer if and only if x_9 will sleep we can infer that for all x_9, if x_9 sleeps, then x_9 is a police officer. From the fact that for all x_9, if x_9 sleeps, then x_9 is a police officer we can infer that if William sleeps, then William is a police officer. Finally, from the fact that if William sleeps, then William is a police officer, and that William is sleeping we can infer that William is a police officer, which contradicts that William is not a police officer. Therefore, the answer is no.