Consider the following premises. If Charles works, then Richard is a sailor. If James were a nurse, then Richard is a sailor. James is a nurse. If Sarah listens to a song, then Charles is working. Can we infer the following from them? Richard is a sailor.
 From the fact that James is a nurse we can infer that James is a nurse or Sarah is listening to a song. From the fact that if Sarah listens to a song, then Charles is working, and that if Charles works, then Richard is a sailor we can infer that if Sarah listens to a song, then Richard is a sailor. Finally, from the fact that if James were a nurse, then Richard is a sailor, that if Sarah listens to a song, then Richard is a sailor, and that James is a nurse or Sarah is listening to a song we can infer that Richard is a sailor. Therefore, the answer is yes.