Consider the following premises. For all x_11, if x_11 listens to a song, then x_11 is reading a book. For all x_11, x_11 will listen to a song. For all x_11, if x_11 reads a book, then x_11 is climbing a mountain. For all x_11, if x_11 takes a plane, then x_11 is a musician. There is at least one x_11 for which x_11 will take a plane. Can we infer the following from them? There is at least one x_11 for which x_11 will climb a mountain and x_11 is a musician.
 From the fact that for all x_11, if x_11 takes a plane, then x_11 is a musician, and that there is at least one x_11 for which x_11 will take a plane we can infer that there is at least one x_11 for which x_11 is a musician. From the fact that for all x_11, if x_11 listens to a song, then x_11 is reading a book, and that for all x_11, x_11 will listen to a song we can infer that for all x_11, x_11 will read a book. From the fact that for all x_11, if x_11 reads a book, then x_11 is climbing a mountain, and that for all x_11, x_11 will read a book we can infer that for all x_11, x_11 will climb a mountain. Finally, from the fact that for all x_11, x_11 will climb a mountain, and that there is at least one x_11 for which x_11 is a musician we can infer that there is at least one x_11 for which x_11 will climb a mountain and x_11 is a musician. Therefore, the answer is yes.