Consider the following premises. James is running if and only if Charles is a police officer. James is running or it is raining. Charles is a police officer or it is not raining. Can we infer the following from them? Charles is not a police officer.
 From the fact that Charles is a police officer or it is not raining we can infer that if it rains, then Charles is a police officer. From the fact that James is running if and only if Charles is a police officer we can infer that if James goes running, then Charles is a police officer. Finally, from the fact that if James goes running, then Charles is a police officer, that if it rains, then Charles is a police officer, and that James is running or it is raining we can infer that Charles is a police officer, which contradicts that Charles is not a police officer. Therefore, the answer is no.