Consider the following premises. For all x_9, x_9 is a janitor if and only if x_9 will listen to a song. For all x_9, if x_9 climbs a mountain, then x_9 is an office clerk. For all x_9, x_9 will not listen to a song. There is at least one x_9 for which if x_9 were an office clerk, then x_9 is a janitor. Can we infer the following from them? There is at least one x_9 for which x_9 will not climb a mountain.
 From the fact that for all x_9, x_9 is a janitor if and only if x_9 will listen to a song, and that for all x_9, x_9 will not listen to a song we can infer that for all x_9, x_9 is not a janitor. From the fact that for all x_9, if x_9 climbs a mountain, then x_9 is an office clerk, and that there is at least one x_9 for which if x_9 were an office clerk, then x_9 is a janitor we can infer that there is at least one x_9 for which if x_9 climbs a mountain, then x_9 is a janitor. Finally, from the fact that there is at least one x_9 for which if x_9 climbs a mountain, then x_9 is a janitor, and that for all x_9, x_9 is not a janitor we can infer that there is at least one x_9 for which x_9 will not climb a mountain. Therefore, the answer is yes.