Consider the following premises. For all x_9, x_9 is sad or x_9 is a soldier. There is at least one x_9 for which if x_9 were sad, then x_9 is a scientist. For all x_9, x_9 is not a scientist. For all x_9, if x_9 were a scientist, then x_9 is sad. Can we infer the following from them? There is at least one x_9 for which x_9 is a soldier.
 From the fact that there is at least one x_9 for which if x_9 were sad, then x_9 is a scientist, and that for all x_9, if x_9 were a scientist, then x_9 is sad we can infer that there is at least one x_9 for which x_9 is sad if and only if x_9 is a scientist. From the fact that there is at least one x_9 for which x_9 is sad if and only if x_9 is a scientist, and that for all x_9, x_9 is not a scientist we can infer that there is at least one x_9 for which x_9 is not sad. Finally, from the fact that for all x_9, x_9 is sad or x_9 is a soldier, and that there is at least one x_9 for which x_9 is not sad we can infer that there is at least one x_9 for which x_9 is a soldier. Therefore, the answer is yes.