Consider the following premises. For all x_9, if x_9 goes running, then x_9 is a bartender. For all x_9, if x_9 works, then x_9 is running. For all x_9, if x_9 were a bartender, then x_9 is a sailor. There is at least one x_9 for which x_9 is a sailor or x_9 will work. For all x_9, if x_9 were a sailor, then x_9 is a bartender. Can we infer the following from them? There is at least one x_9 for which x_9 is a bartender.
 From the fact that for all x_9, if x_9 were a sailor, then x_9 is a bartender, and that for all x_9, if x_9 were a bartender, then x_9 is a sailor we can infer that for all x_9, x_9 is a sailor if and only if x_9 is a bartender. From the fact that for all x_9, x_9 is a sailor if and only if x_9 is a bartender we can infer that for all x_9, if x_9 were a sailor, then x_9 is a bartender. From the fact that for all x_9, if x_9 works, then x_9 is running, and that for all x_9, if x_9 goes running, then x_9 is a bartender we can infer that for all x_9, if x_9 works, then x_9 is a bartender. Finally, from the fact that for all x_9, if x_9 were a sailor, then x_9 is a bartender, that for all x_9, if x_9 works, then x_9 is a bartender, and that there is at least one x_9 for which x_9 is a sailor or x_9 will work we can infer that there is at least one x_9 for which x_9 is a bartender. Therefore, the answer is yes.