Consider the following premises. There is at least one x_5 for which x_5 will take a plane. For all x_5, if x_5 plays a game, then x_5 is happy. For all x_5, if x_5 were happy, then x_5 is a scientist. For all x_5, x_5 will play a game. Can we infer the following from them? There is at least one x_5 for which x_5 will take a plane and x_5 is a scientist.
 From the fact that for all x_5, if x_5 plays a game, then x_5 is happy, and that for all x_5, x_5 will play a game we can infer that for all x_5, x_5 is happy. From the fact that for all x_5, if x_5 were happy, then x_5 is a scientist, and that for all x_5, x_5 is happy we can infer that for all x_5, x_5 is a scientist. Finally, from the fact that there is at least one x_5 for which x_5 will take a plane, and that for all x_5, x_5 is a scientist we can infer that there is at least one x_5 for which x_5 will take a plane and x_5 is a scientist. Therefore, the answer is yes.