Consider the following premises. For all x_9, if x_9 climbs a mountain, then x_9 is a mechanic. For all x_9, if x_9 reads a book, then x_9 is climbing a mountain. There is at least one x_9 for which x_9 is not a mechanic. For all x_9, if x_9 climbs a mountain, then x_9 is reading a book. Can we infer the following from them? There is at least one x_9 for which x_9 will not read a book.
 From the fact that for all x_9, if x_9 reads a book, then x_9 is climbing a mountain, and that for all x_9, if x_9 climbs a mountain, then x_9 is reading a book we can infer that for all x_9, x_9 will read a book if and only if x_9 will climb a mountain. From the fact that for all x_9, x_9 will read a book if and only if x_9 will climb a mountain we can infer that for all x_9, if x_9 reads a book, then x_9 is climbing a mountain. From the fact that for all x_9, if x_9 reads a book, then x_9 is climbing a mountain, and that for all x_9, if x_9 climbs a mountain, then x_9 is a mechanic we can infer that for all x_9, if x_9 reads a book, then x_9 is a mechanic. Finally, from the fact that for all x_9, if x_9 reads a book, then x_9 is a mechanic, and that there is at least one x_9 for which x_9 is not a mechanic we can infer that there is at least one x_9 for which x_9 will not read a book. Therefore, the answer is yes.