Consider the following premises. For all x_14, if x_14 plays tennis, then x_14 is drinking water. There is at least one x_14 for which if x_14 listens to a song, then x_14 is an office clerk. For all x_14, x_14 will drink water if and only if x_14 will listen to a song. For all x_14, x_14 will play tennis. For all x_14, if x_14 writes a letter, then x_14 is an office clerk. Can we infer the following from them? There is at least one x_14 for which x_14 is an office clerk.
 From the fact that for all x_14, x_14 will drink water if and only if x_14 will listen to a song we can infer that for all x_14, if x_14 drinks water, then x_14 is listening to a song. From the fact that for all x_14, if x_14 plays tennis, then x_14 is drinking water, and that for all x_14, if x_14 drinks water, then x_14 is listening to a song we can infer that for all x_14, if x_14 plays tennis, then x_14 is listening to a song. From the fact that for all x_14, if x_14 plays tennis, then x_14 is listening to a song, and that there is at least one x_14 for which if x_14 listens to a song, then x_14 is an office clerk we can infer that there is at least one x_14 for which if x_14 plays tennis, then x_14 is an office clerk. From the fact that for all x_14, x_14 will play tennis we can infer that for all x_14, x_14 will play tennis or x_14 will write a letter. Finally, from the fact that there is at least one x_14 for which if x_14 plays tennis, then x_14 is an office clerk, that for all x_14, if x_14 writes a letter, then x_14 is an office clerk, and that for all x_14, x_14 will play tennis or x_14 will write a letter we can infer that there is at least one x_14 for which x_14 is an office clerk. Therefore, the answer is yes.