Consider the following premises. For all x_11, x_11 will not make tea. For all x_11, if x_11 were a police officer, then x_11 is a bartender. For all x_11, if x_11 listens to a song, then x_11 is sad. For all x_11, x_11 will make tea if and only if x_11 is sad. For all x_11, if x_11 were a bartender, then x_11 is listening to a song. Can we infer the following from them? For all x_11, x_11 is not a police officer.
 From the fact that for all x_11, x_11 will make tea if and only if x_11 is sad, and that for all x_11, x_11 will not make tea we can infer that for all x_11, x_11 is not sad. From the fact that for all x_11, if x_11 listens to a song, then x_11 is sad, and that for all x_11, x_11 is not sad we can infer that for all x_11, x_11 will not listen to a song. From the fact that for all x_11, if x_11 were a bartender, then x_11 is listening to a song, and that for all x_11, x_11 will not listen to a song we can infer that for all x_11, x_11 is not a bartender. Finally, from the fact that for all x_11, if x_11 were a police officer, then x_11 is a bartender, and that for all x_11, x_11 is not a bartender we can infer that for all x_11, x_11 is not a police officer. Therefore, the answer is yes.