Consider the following premises. There is at least one x_9 for which x_9 will play tennis if and only if x_9 will read a book. For all x_9, if x_9 works, then x_9 is playing tennis. For all x_9, x_9 will not listen to a song. For all x_9, x_9 will listen to a song or x_9 will read a book. Can we infer the following from them? There is at least one x_9 for which x_9 will play tennis.
 From the fact that for all x_9, x_9 will listen to a song or x_9 will read a book, and that for all x_9, x_9 will not listen to a song we can infer that for all x_9, x_9 will read a book. From the fact that there is at least one x_9 for which x_9 will play tennis if and only if x_9 will read a book we can infer that there is at least one x_9 for which if x_9 reads a book, then x_9 is playing tennis. From the fact that for all x_9, x_9 will read a book we can infer that for all x_9, x_9 will read a book or x_9 will work. Finally, from the fact that there is at least one x_9 for which if x_9 reads a book, then x_9 is playing tennis, that for all x_9, if x_9 works, then x_9 is playing tennis, and that for all x_9, x_9 will read a book or x_9 will work we can infer that there is at least one x_9 for which x_9 will play tennis. Therefore, the answer is yes.