Consider the following premises. For all x_9, if x_9 works, then x_9 is an electrician. For all x_9, x_9 is not an electrician. For all x_9, if x_9 were poor, then x_9 is sad. For all x_9, x_9 will work if and only if x_9 is sad. Can we infer the following from them? For all x_9, x_9 is not poor.
 From the fact that for all x_9, if x_9 works, then x_9 is an electrician, and that for all x_9, x_9 is not an electrician we can infer that for all x_9, x_9 will not work. From the fact that for all x_9, x_9 will work if and only if x_9 is sad we can infer that for all x_9, if x_9 were sad, then x_9 is working. From the fact that for all x_9, if x_9 were poor, then x_9 is sad, and that for all x_9, if x_9 were sad, then x_9 is working we can infer that for all x_9, if x_9 were poor, then x_9 is working. Finally, from the fact that for all x_9, if x_9 were poor, then x_9 is working, and that for all x_9, x_9 will not work we can infer that for all x_9, x_9 is not poor. Therefore, the answer is yes.