Consider the following premises. For all x_9, x_9 is not sad. There is at least one x_9 for which x_9 is a server if and only if x_9 is sad. For all x_9, x_9 is a server. Can we infer the following from them? There is at least one x_9 for which x_9 will go running.
 From the fact that for all x_9, x_9 is a server we can infer that for all x_9, x_9 is a server or x_9 will go running. 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 sad, and that for all x_9, x_9 is not sad we can infer that there is at least one x_9 for which x_9 is not a server. Finally, from the fact that for all x_9, x_9 is a server or x_9 will go running, and that there is at least one x_9 for which x_9 is not a server we can infer that there is at least one x_9 for which x_9 will go running. Therefore, the answer is yes. Notice, however, that the premises were contradictory, so we can infer anything from them.