Consider the following premises. For all x_8, x_8 will play squash if and only if x_8 will play tennis. There is at least one x_8 for which x_8 is a scientist. For all x_8, x_8 will play tennis. Can we infer the following from them? There is at least one x_8 for which x_8 will play squash and x_8 is a scientist.
 From the fact that for all x_8, x_8 will play squash if and only if x_8 will play tennis we can infer that for all x_8, if x_8 plays tennis, then x_8 is playing squash. From the fact that for all x_8, if x_8 plays tennis, then x_8 is playing squash, and that for all x_8, x_8 will play tennis we can infer that for all x_8, x_8 will play squash. Finally, from the fact that for all x_8, x_8 will play squash, and that there is at least one x_8 for which x_8 is a scientist we can infer that there is at least one x_8 for which x_8 will play squash and x_8 is a scientist. Therefore, the answer is yes.