Consider the following premises. For all x, if x takes a plane, then x is a scientist. There is at least one x for which x is a police officer if and only if x will drive a car. For all x, if x were a police officer, then x is taking a plane. Can we infer the following from them? There is at least one x for which if x drives a car, then x is a scientist.
 From the fact that for all x, if x were a police officer, then x is taking a plane, and that for all x, if x takes a plane, then x is a scientist we can infer that for all x, if x were a police officer, then x is a scientist. From the fact that there is at least one x for which x is a police officer if and only if x will drive a car we can infer that there is at least one x for which if x drives a car, then x is a police officer. Finally, from the fact that there is at least one x for which if x drives a car, then x is a police officer, and that for all x, if x were a police officer, then x is a scientist we can infer that there is at least one x for which if x drives a car, then x is a scientist. Therefore, the answer is yes.