Consider the following premises. For all x_7, x_7 is a musician or x_7 will not read a book. For all x_7, if x_7 climbs a mountain, then x_7 is reading a book. There is at least one x_7 for which x_7 will climb a mountain. Can we infer the following from them? There is at least one x_7 for which x_7 is a musician.
 From the fact that for all x_7, if x_7 climbs a mountain, then x_7 is reading a book, and that there is at least one x_7 for which x_7 will climb a mountain we can infer that there is at least one x_7 for which x_7 will read a book. From the fact that for all x_7, x_7 is a musician or x_7 will not read a book we can infer that for all x_7, if x_7 reads a book, then x_7 is a musician. Finally, from the fact that for all x_7, if x_7 reads a book, then x_7 is a musician, and that there is at least one x_7 for which x_7 will read a book we can infer that there is at least one x_7 for which x_7 is a musician. Therefore, the answer is yes.