Consider the following premises. For all x_12, if x_12 plays squash, then x_12 is a politician. For all x_12, x_12 is a janitor or x_12 will play squash. There is at least one x_12 for which x_12 is a scientist. For all x_12, x_12 will read a book if and only if x_12 is a politician. For all x_12, if x_12 were a janitor, then x_12 is a politician. Can we infer the following from them? There is at least one x_12 for which x_12 will read a book and x_12 is a scientist.
 From the fact that for all x_12, x_12 will read a book if and only if x_12 is a politician we can infer that for all x_12, if x_12 were a politician, then x_12 is reading a book. From the fact that for all x_12, if x_12 were a janitor, then x_12 is a politician, that for all x_12, if x_12 plays squash, then x_12 is a politician, and that for all x_12, x_12 is a janitor or x_12 will play squash we can infer that for all x_12, x_12 is a politician. From the fact that for all x_12, if x_12 were a politician, then x_12 is reading a book, and that for all x_12, x_12 is a politician we can infer that for all x_12, x_12 will read a book. Finally, from the fact that for all x_12, x_12 will read a book, and that there is at least one x_12 for which x_12 is a scientist we can infer that there is at least one x_12 for which x_12 will read a book and x_12 is a scientist. Therefore, the answer is yes.