Consider the following premises. It is not raining. It is raining if and only if Karen is running. Charles is not curious. Charles is curious if and only if Jennifer is a writer. Can we infer the following from them? Jennifer is not a writer and Karen is not running.
 From the fact that it is raining if and only if Karen is running, and that it is not raining we can infer that Karen is not running. From the fact that Charles is curious if and only if Jennifer is a writer, and that Charles is not curious we can infer that Jennifer is not a writer. Finally, from the fact that Jennifer is not a writer, and that Karen is not running we can infer that Jennifer is not a writer and Karen is not running. Therefore, the answer is yes.