Consider the following premises. For all x_13, x_13 is an astronaut if and only if x_13 is a taxi driver. It is overcast if and only if Joseph is a taxi driver. It is overcast or Joseph is an astronaut. Can we infer the following from them? Joseph is a taxi driver.
 From the fact that for all x_13, x_13 is an astronaut if and only if x_13 is a taxi driver we can infer that for all x_13, if x_13 were an astronaut, then x_13 is a taxi driver. From the fact that for all x_13, if x_13 were an astronaut, then x_13 is a taxi driver we can infer that if Joseph were an astronaut, then Joseph is a taxi driver. From the fact that it is overcast if and only if Joseph is a taxi driver we can infer that if it is overcast, then Joseph is a taxi driver. Finally, from the fact that if it is overcast, then Joseph is a taxi driver, that if Joseph were an astronaut, then Joseph is a taxi driver, and that it is overcast or Joseph is an astronaut we can infer that Joseph is a taxi driver. Therefore, the answer is yes.