Consider the following premises. For all x_6, if x_6 takes a plane, then x_6 is reading a book. For all x_6, x_6 is not a scientist. For all x_6, x_6 is a scientist if and only if x_6 will take a plane. There is at least one x_6 for which if x_6 reads a book, then x_6 is taking a plane. Can we infer the following from them? There is at least one x_6 for which x_6 will not read a book.
 From the fact that for all x_6, if x_6 takes a plane, then x_6 is reading a book, and that there is at least one x_6 for which if x_6 reads a book, then x_6 is taking a plane we can infer that there is at least one x_6 for which x_6 will take a plane if and only if x_6 will read a book. From the fact that for all x_6, x_6 is a scientist if and only if x_6 will take a plane, and that for all x_6, x_6 is not a scientist we can infer that for all x_6, x_6 will not take a plane. Finally, from the fact that there is at least one x_6 for which x_6 will take a plane if and only if x_6 will read a book, and that for all x_6, x_6 will not take a plane we can infer that there is at least one x_6 for which x_6 will not read a book. Therefore, the answer is yes.