Consider the following premises. For all x_4, if x_4 were a politician, then x_4 is playing squash. For all x_4, if x_4 were a police officer, then x_4 is reading a book. For all x_4, x_4 is happy or x_4 is a police officer. For all x_4, x_4 is not happy or x_4 is a politician. There is at least one x_4 for which if x_4 plays squash, then x_4 is reading a book. Can we infer the following from them? There is at least one x_4 for which x_4 will read a book.
 From the fact that for all x_4, if x_4 were a politician, then x_4 is playing squash, and that there is at least one x_4 for which if x_4 plays squash, then x_4 is reading a book we can infer that there is at least one x_4 for which if x_4 were a politician, then x_4 is reading a book. From the fact that for all x_4, x_4 is happy or x_4 is a police officer, and that for all x_4, x_4 is not happy or x_4 is a politician we can infer that for all x_4, x_4 is a police officer or x_4 is a politician. Finally, from the fact that for all x_4, if x_4 were a police officer, then x_4 is reading a book, that there is at least one x_4 for which if x_4 were a politician, then x_4 is reading a book, and that for all x_4, x_4 is a police officer or x_4 is a politician we can infer that there is at least one x_4 for which x_4 will read a book. Therefore, the answer is yes.