Consider the following premises. If Joseph works, then Jessica is driving a car. If Jessica drives a car, then Richard is a musician. Charles is a cashier. If Charles were a cashier, then Joseph is working. Can we infer the following from them? Richard is not a musician.
 From the fact that if Charles were a cashier, then Joseph is working, and that if Joseph works, then Jessica is driving a car we can infer that if Charles were a cashier, then Jessica is driving a car. From the fact that if Charles were a cashier, then Jessica is driving a car, and that Charles is a cashier we can infer that Jessica is driving a car. Finally, from the fact that if Jessica drives a car, then Richard is a musician, and that Jessica is driving a car we can infer that Richard is a musician, which contradicts that Richard is not a musician. Therefore, the answer is no.