Consider the following premises. There is at least one x_18 for which x_18 will climb a mountain or x_18 will take a plane. For all x_18, if x_18 climbs a mountain, then x_18 is working. For all x_18, if x_18 works, then x_18 is sleeping. For all x_18, if x_18 takes a plane, then x_18 is working. Can we infer the following from them? There is at least one x_18 for which x_18 will sleep or x_18 is excited.
 From the fact that for all x_18, if x_18 climbs a mountain, then x_18 is working, that for all x_18, if x_18 takes a plane, then x_18 is working, and that there is at least one x_18 for which x_18 will climb a mountain or x_18 will take a plane we can infer that there is at least one x_18 for which x_18 will work. From the fact that for all x_18, if x_18 works, then x_18 is sleeping, and that there is at least one x_18 for which x_18 will work we can infer that there is at least one x_18 for which x_18 will sleep. Finally, from the fact that there is at least one x_18 for which x_18 will sleep we can infer that there is at least one x_18 for which x_18 will sleep or x_18 is excited. Therefore, the answer is yes.