Consider the following premises. For all x_10, x_10 is an astronaut if and only if x_10 is a bartender. For all x_10, x_10 is an astronaut. There is at least one x_10 for which x_10 will take a plane if and only if x_10 is a bartender. Can we infer the following from them? For all x_10, x_10 is not a bartender.
 From the fact that there is at least one x_10 for which x_10 will take a plane if and only if x_10 is a bartender we can infer that there is at least one x_10 for which if x_10 takes a plane, then x_10 is a bartender. From the fact that for all x_10, x_10 is an astronaut we can infer that for all x_10, x_10 is an astronaut or x_10 will take a plane. From the fact that for all x_10, x_10 is an astronaut if and only if x_10 is a bartender we can infer that for all x_10, if x_10 were an astronaut, then x_10 is a bartender. Finally, from the fact that for all x_10, if x_10 were an astronaut, then x_10 is a bartender, that there is at least one x_10 for which if x_10 takes a plane, then x_10 is a bartender, and that for all x_10, x_10 is an astronaut or x_10 will take a plane we can infer that there is at least one x_10 for which x_10 is a bartender, which contradicts that For all x_10, x_10 is not a bartender. Therefore, the answer is no.