Consider the following premises. There is at least one x_5 for which if x_5 were fast, then x_5 is a bartender. For all x_5, if x_5 were a bartender, then x_5 is working. For all x_5, x_5 is fast or x_5 is not a server. Can we infer the following from them? There is at least one x_5 for which if x_5 were a server, then x_5 is working.
 From the fact that there is at least one x_5 for which if x_5 were fast, then x_5 is a bartender, and that for all x_5, if x_5 were a bartender, then x_5 is working we can infer that there is at least one x_5 for which if x_5 were fast, then x_5 is working. From the fact that for all x_5, x_5 is fast or x_5 is not a server we can infer that for all x_5, if x_5 were a server, then x_5 is fast. Finally, from the fact that for all x_5, if x_5 were a server, then x_5 is fast, and that there is at least one x_5 for which if x_5 were fast, then x_5 is working we can infer that there is at least one x_5 for which if x_5 were a server, then x_5 is working. Therefore, the answer is yes.