Consider the following premises. For all x_15, x_15 will drive a car or x_15 will cook. For all x_15, if x_15 cooks, then x_15 is a janitor. For all x_15, if x_15 climbs a mountain, then x_15 is taking a plane. There is at least one x_15 for which if x_15 drives a car, then x_15 is a janitor. For all x_15, if x_15 takes a plane, then x_15 is not a janitor. Can we infer the following from them? There is at least one x_15 for which x_15 will not climb a mountain.
 From the fact that there is at least one x_15 for which if x_15 drives a car, then x_15 is a janitor, that for all x_15, if x_15 cooks, then x_15 is a janitor, and that for all x_15, x_15 will drive a car or x_15 will cook we can infer that there is at least one x_15 for which x_15 is a janitor. From the fact that for all x_15, if x_15 takes a plane, then x_15 is not a janitor, and that there is at least one x_15 for which x_15 is a janitor we can infer that there is at least one x_15 for which x_15 will not take a plane. Finally, from the fact that for all x_15, if x_15 climbs a mountain, then x_15 is taking a plane, and that there is at least one x_15 for which x_15 will not take a plane we can infer that there is at least one x_15 for which x_15 will not climb a mountain. Therefore, the answer is yes.