Consider the following premises. For all x_13, x_13 will drink water if and only if x_13 will play tennis. For all x_13, x_13 is rich. There is at least one x_13 for which x_13 will play tennis. Can we infer the following from them? There is at least one x_13 for which x_13 will drink water and x_13 is rich.
 From the fact that for all x_13, x_13 will drink water if and only if x_13 will play tennis we can infer that for all x_13, if x_13 plays tennis, then x_13 is drinking water. From the fact that for all x_13, if x_13 plays tennis, then x_13 is drinking water, and that there is at least one x_13 for which x_13 will play tennis we can infer that there is at least one x_13 for which x_13 will drink water. Finally, from the fact that there is at least one x_13 for which x_13 will drink water, and that for all x_13, x_13 is rich we can infer that there is at least one x_13 for which x_13 will drink water and x_13 is rich. Therefore, the answer is yes.