Consider the following premises. For all x_8, x_8 is an astronaut if and only if x_8 is a police officer. There is at least one x_8 for which x_8 is a police officer or x_8 is a taxi driver. For all x_8, if x_8 were a taxi driver, then x_8 is an office clerk. For all x_8, if x_8 were an office clerk, then x_8 is an astronaut. Can we infer the following from them? For all x_8, x_8 is not an astronaut.
 From the fact that for all x_8, x_8 is an astronaut if and only if x_8 is a police officer we can infer that for all x_8, if x_8 were a police officer, then x_8 is an astronaut. From the fact that for all x_8, if x_8 were a taxi driver, then x_8 is an office clerk, and that for all x_8, if x_8 were an office clerk, then x_8 is an astronaut we can infer that for all x_8, if x_8 were a taxi driver, then x_8 is an astronaut. Finally, from the fact that for all x_8, if x_8 were a police officer, then x_8 is an astronaut, that for all x_8, if x_8 were a taxi driver, then x_8 is an astronaut, and that there is at least one x_8 for which x_8 is a police officer or x_8 is a taxi driver we can infer that there is at least one x_8 for which x_8 is an astronaut, which contradicts that For all x_8, x_8 is not an astronaut. Therefore, the answer is no.