Consider the following premises. For all x_9, if x_9 takes a plane, then x_9 is curious. There is at least one x_9 for which x_9 is a server if and only if x_9 is curious. For all x_9, x_9 will take a plane. Can we infer the following from them? There is at least one x_9 for which x_9 is a server.
 From the fact that there is at least one x_9 for which x_9 is a server if and only if x_9 is curious we can infer that there is at least one x_9 for which if x_9 were curious, then x_9 is a server. From the fact that for all x_9, if x_9 takes a plane, then x_9 is curious, and that for all x_9, x_9 will take a plane we can infer that for all x_9, x_9 is curious. Finally, from the fact that there is at least one x_9 for which if x_9 were curious, then x_9 is a server, and that for all x_9, x_9 is curious we can infer that there is at least one x_9 for which x_9 is a server. Therefore, the answer is yes.