Consider the following premises. For all x_5, if x_5 were poor, then x_5 is sad. For all x_5, x_5 is not a poet. There is at least one x_5 for which if x_5 were sad, then x_5 is poor. For all x_5, x_5 is a poet if and only if x_5 is poor. Can we infer the following from them? For all x_5, x_5 is sad.
 From the fact that there is at least one x_5 for which if x_5 were sad, then x_5 is poor, and that for all x_5, if x_5 were poor, then x_5 is sad we can infer that there is at least one x_5 for which x_5 is sad if and only if x_5 is poor. From the fact that for all x_5, x_5 is a poet if and only if x_5 is poor, and that for all x_5, x_5 is not a poet we can infer that for all x_5, x_5 is not poor. Finally, from the fact that there is at least one x_5 for which x_5 is sad if and only if x_5 is poor, and that for all x_5, x_5 is not poor we can infer that there is at least one x_5 for which x_5 is not sad, which contradicts that For all x_5, x_5 is sad. Therefore, the answer is no.