Consider the following premises. For all z_2, if z_2 drives a car, then z_2 is a server. For all z_2, if z_2 were a server, then z_2 is driving a car. There is at least one z_2 for which if z_2 were a server, then z_2 is driving a car. Can we infer the following from them? There is at least one z_2 for which if z_2 drives a car, then z_2 is a server.
 From the fact that there is at least one z_2 for which if z_2 were a server, then z_2 is driving a car, and that for all z_2, if z_2 drives a car, then z_2 is a server we can infer that there is at least one z_2 for which z_2 is a server if and only if z_2 will drive a car. Finally, from the fact that there is at least one z_2 for which z_2 is a server if and only if z_2 will drive a car we can infer that there is at least one z_2 for which if z_2 drives a car, then z_2 is a server. Therefore, the answer is yes.