Consider the following premises. Sarah is fast if and only if Thomas is a doctor. It is sunny. If it is sunny, then Sarah is fast. If Thomas were a doctor, then Jessica is an electrician. Can we infer the following from them? Jessica is an electrician.
 From the fact that Sarah is fast if and only if Thomas is a doctor we can infer that if Sarah were fast, then Thomas is a doctor. From the fact that if it is sunny, then Sarah is fast, and that if Sarah were fast, then Thomas is a doctor we can infer that if it is sunny, then Thomas is a doctor. From the fact that if it is sunny, then Thomas is a doctor, and that if Thomas were a doctor, then Jessica is an electrician we can infer that if it is sunny, then Jessica is an electrician. Finally, from the fact that if it is sunny, then Jessica is an electrician, and that it is sunny we can infer that Jessica is an electrician. Therefore, the answer is yes.