Consider the following premises. For all x_3, x_3 will take a plane and x_3 will listen to a song. For all x_3, x_3 will sleep. Can we infer the following from them? For all x_3, x_3 will sleep and x_3 will take a plane.
 From the fact that for all x_3, x_3 will take a plane and x_3 will listen to a song we can infer that for all x_3, x_3 will take a plane. Finally, from the fact that for all x_3, x_3 will sleep, and that for all x_3, x_3 will take a plane we can infer that for all x_3, x_3 will sleep and x_3 will take a plane. Therefore, the answer is yes.