Consider the following premises. For all x_10, x_10 is not poor. There is at least one x_10 for which x_10 is poor if and only if x_10 is an electrician. For all x_10, x_10 is an electrician or x_10 will not play tennis. Can we infer the following from them? There is at least one x_10 for which x_10 will not play tennis.
 From the fact that for all x_10, x_10 is an electrician or x_10 will not play tennis we can infer that for all x_10, if x_10 plays tennis, then x_10 is an electrician. From the fact that there is at least one x_10 for which x_10 is poor if and only if x_10 is an electrician, and that for all x_10, x_10 is not poor we can infer that there is at least one x_10 for which x_10 is not an electrician. Finally, from the fact that for all x_10, if x_10 plays tennis, then x_10 is an electrician, and that there is at least one x_10 for which x_10 is not an electrician we can infer that there is at least one x_10 for which x_10 will not play tennis. Therefore, the answer is yes.