Consider the following premises. For all x_12, x_12 will read a book. For all x_12, x_12 is a doctor or x_12 is sad. There is at least one x_12 for which if x_12 were sad, then x_12 is playing tennis. For all x_12, if x_12 were a doctor, then x_12 is playing tennis. For all x_12, if x_12 reads a book, then x_12 is an astronaut. Can we infer the following from them? There is at least one x_12 for which x_12 is an astronaut and x_12 will play tennis.
 From the fact that for all x_12, if x_12 were a doctor, then x_12 is playing tennis, that there is at least one x_12 for which if x_12 were sad, then x_12 is playing tennis, and that for all x_12, x_12 is a doctor or x_12 is sad we can infer that there is at least one x_12 for which x_12 will play tennis. From the fact that for all x_12, if x_12 reads a book, then x_12 is an astronaut, and that for all x_12, x_12 will read a book we can infer that for all x_12, x_12 is an astronaut. Finally, from the fact that for all x_12, x_12 is an astronaut, and that there is at least one x_12 for which x_12 will play tennis we can infer that there is at least one x_12 for which x_12 is an astronaut and x_12 will play tennis. Therefore, the answer is yes.