Consider the following premises. There is at least one x_9 for which if x_9 listens to a song, then x_9 is climbing a mountain. For all x_9, x_9 will listen to a song or x_9 is sad. For all x_9, if x_9 were sad, then x_9 is climbing a mountain. For all x_9, x_9 will play tennis. Can we infer the following from them? For all x_9, x_9 will not climb a mountain.
 From the fact that there is at least one x_9 for which if x_9 listens to a song, then x_9 is climbing a mountain, that for all x_9, if x_9 were sad, then x_9 is climbing a mountain, and that for all x_9, x_9 will listen to a song or x_9 is sad we can infer that there is at least one x_9 for which x_9 will climb a mountain. From the fact that there is at least one x_9 for which x_9 will climb a mountain, and that for all x_9, x_9 will play tennis we can infer that there is at least one x_9 for which x_9 will climb a mountain and x_9 will play tennis. Finally, from the fact that there is at least one x_9 for which x_9 will climb a mountain and x_9 will play tennis we can infer that there is at least one x_9 for which x_9 will climb a mountain, which contradicts that For all x_9, x_9 will not climb a mountain. Therefore, the answer is no.