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