Consider the following premises. For all x_5, if x_5 takes a plane, then x_5 is a soldier. For all x_5, x_5 will take a plane. For all x_5, x_5 is a taxi driver and x_5 will sleep. Can we infer the following from them? If we can, name the inference rule being used: For all x_5, x_5 is a taxi driver and x_5 is a soldier.
 From the fact that for all x_5, if x_5 takes a plane, then x_5 is a soldier, and that for all x_5, x_5 will take a plane we can infer that for all x_5, x_5 is a soldier via universal modus ponens. From the fact that for all x_5, x_5 is a taxi driver and x_5 will sleep we can infer that for all x_5, x_5 is a taxi driver via universal simplification. Finally, from the fact that for all x_5, x_5 is a taxi driver, and that for all x_5, x_5 is a soldier we can infer that for all x_5, x_5 is a taxi driver and x_5 is a soldier via universal conjunction. Therefore, the answer is yes.