Consider the following premises. There is at least one x_13 for which x_13 is not an office clerk. For all x_13, x_13 is an office clerk or x_13 is fast. For all x_13, if x_13 reads a book, then x_13 is not fast. For all x_13, x_13 is a bartender if and only if x_13 will read a book. Can we infer the following from them? There is at least one x_13 for which x_13 is not a bartender.
 From the fact that for all x_13, x_13 is an office clerk or x_13 is fast, and that there is at least one x_13 for which x_13 is not an office clerk we can infer that there is at least one x_13 for which x_13 is fast. From the fact that for all x_13, if x_13 reads a book, then x_13 is not fast, and that there is at least one x_13 for which x_13 is fast we can infer that there is at least one x_13 for which x_13 will not read a book. Finally, from the fact that for all x_13, x_13 is a bartender if and only if x_13 will read a book, and that there is at least one x_13 for which x_13 will not read a book we can infer that there is at least one x_13 for which x_13 is not a bartender. Therefore, the answer is yes.