Consider the following premises. It is not windy. Linda is a server if and only if it is windy. If John were a police officer, then it is raining. It is raining if and only if Linda is a server. If it rains, then John is a police officer. Can we infer the following from them? John is not a police officer.
 From the fact that Linda is a server if and only if it is windy, and that it is not windy we can infer that Linda is not a server. From the fact that if John were a police officer, then it is raining, and that if it rains, then John is a police officer we can infer that John is a police officer if and only if it is raining. From the fact that John is a police officer if and only if it is raining we can infer that if John were a police officer, then it is raining. From the fact that it is raining if and only if Linda is a server, and that Linda is not a server we can infer that it is not raining. Finally, from the fact that if John were a police officer, then it is raining, and that it is not raining we can infer that John is not a police officer. Therefore, the answer is yes.