Consider the following premises. For all x_3, if x_3 were curious, then x_3 is a poet. There is at least one x_3 for which x_3 is not a poet. For all x_3, if x_3 were a taxi driver, then x_3 is curious. For all x_3, if x_3 were curious, then x_3 is a taxi driver. Can we infer the following from them? There is at least one x_3 for which x_3 is not a taxi driver.
 From the fact that for all x_3, if x_3 were curious, then x_3 is a poet, and that there is at least one x_3 for which x_3 is not a poet we can infer that there is at least one x_3 for which x_3 is not curious. From the fact that for all x_3, if x_3 were curious, then x_3 is a taxi driver, and that for all x_3, if x_3 were a taxi driver, then x_3 is curious we can infer that for all x_3, x_3 is curious if and only if x_3 is a taxi driver. Finally, from the fact that for all x_3, x_3 is curious if and only if x_3 is a taxi driver, and that there is at least one x_3 for which x_3 is not curious we can infer that there is at least one x_3 for which x_3 is not a taxi driver. Therefore, the answer is yes.