Consider the following premises. For all x_16, x_16 is a taxi driver if and only if x_16 is a server. For all x_16, x_16 is a taxi driver. Can we infer the following from them? Jessica is not a server.
 From the fact that for all x_16, x_16 is a taxi driver if and only if x_16 is a server we can infer that for all x_16, if x_16 were a taxi driver, then x_16 is a server. Finally, from the fact that for all x_16, if x_16 were a taxi driver, then x_16 is a server, and that for all x_16, x_16 is a taxi driver we can infer that for all x_16, x_16 is a server, which contradicts that Jessica is not a server. Therefore, the answer is no.