Consider the following premises. For all x_16, x_16 is not happy. For all x_16, if x_16 were a taxi driver, then x_16 is a politician. For all x_16, if x_16 were a sailor, then x_16 is a poet. For all x_16, x_16 is a sailor if and only if x_16 is a politician. For all x_16, x_16 is happy if and only if x_16 is a poet. Can we infer the following from them? For all x_16, x_16 is not a taxi driver.
 From the fact that for all x_16, x_16 is a sailor if and only if x_16 is a politician we can infer that for all x_16, if x_16 were a politician, then x_16 is a sailor. From the fact that for all x_16, if x_16 were a politician, then x_16 is a sailor, and that for all x_16, if x_16 were a sailor, then x_16 is a poet we can infer that for all x_16, if x_16 were a politician, then x_16 is a poet. From the fact that for all x_16, x_16 is happy if and only if x_16 is a poet, and that for all x_16, x_16 is not happy we can infer that for all x_16, x_16 is not a poet. From the fact that for all x_16, if x_16 were a taxi driver, then x_16 is a politician, and that for all x_16, if x_16 were a politician, then x_16 is a poet we can infer that for all x_16, if x_16 were a taxi driver, then x_16 is a poet. Finally, from the fact that for all x_16, if x_16 were a taxi driver, then x_16 is a poet, and that for all x_16, x_16 is not a poet we can infer that for all x_16, x_16 is not a taxi driver. Therefore, the answer is yes.