Consider the following premises. For all x_5, x_5 will not work. For all x_5, if x_5 works, then x_5 is drinking water. For all x_5, if x_5 takes a plane, then x_5 is drinking water. For all x_5, if x_5 drinks water, then x_5 is working. Can we infer the following from them? There is at least one x_5 for which x_5 will take a plane.
 From the fact that for all x_5, if x_5 drinks water, then x_5 is working, and that for all x_5, if x_5 works, then x_5 is drinking water we can infer that for all x_5, x_5 will drink water if and only if x_5 will work. From the fact that for all x_5, x_5 will drink water if and only if x_5 will work, and that for all x_5, x_5 will not work we can infer that for all x_5, x_5 will not drink water. Finally, from the fact that for all x_5, if x_5 takes a plane, then x_5 is drinking water, and that for all x_5, x_5 will not drink water we can infer that for all x_5, x_5 will not take a plane, which contradicts that There is at least one x_5 for which x_5 will take a plane. Therefore, the answer is no.