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