Consider the following premises. For all x_16, x_16 will not play squash. For all x_16, if x_16 reads a book, then x_16 is drinking water. For all x_16, if x_16 drinks water, then x_16 is an electrician. For all x_16, if x_16 were a janitor, then x_16 is playing squash. For all x_16, x_16 is a janitor if and only if x_16 is an electrician. Can we infer the following from them? If we can, name the inference rule being used: For all x_16, x_16 will not read a book.
 From the fact that for all x_16, x_16 is a janitor if and only if x_16 is an electrician we can infer that for all x_16, if x_16 were an electrician, then x_16 is a janitor via universal biconditional elimination. From the fact that for all x_16, if x_16 were a janitor, then x_16 is playing squash, and that for all x_16, x_16 will not play squash we can infer that for all x_16, x_16 is not a janitor via universal modus tollens. From the fact that for all x_16, if x_16 drinks water, then x_16 is an electrician, and that for all x_16, if x_16 were an electrician, then x_16 is a janitor we can infer that for all x_16, if x_16 drinks water, then x_16 is a janitor via universal transitivity. From the fact that for all x_16, if x_16 drinks water, then x_16 is a janitor, and that for all x_16, x_16 is not a janitor we can infer that for all x_16, x_16 will not drink water via universal modus tollens. Finally, from the fact that for all x_16, if x_16 reads a book, then x_16 is drinking water, and that for all x_16, x_16 will not drink water we can infer that for all x_16, x_16 will not read a book via universal modus tollens. Therefore, the answer is yes.