Consider the following premises. For all x_11, x_11 is an office clerk or x_11 will drive a car. For all x_11, if x_11 drives a car, then x_11 is a sailor. For all x_11, if x_11 were an office clerk, then x_11 is a sailor. There is at least one x_11 for which if x_11 listens to a song, then x_11 is excited. For all x_11, if x_11 were a sailor, then x_11 is listening to a song. For all x_11, if x_11 were excited, then x_11 is climbing a mountain. Can we infer the following from them? There is at least one x_11 for which x_11 will climb a mountain.
 From the fact that for all x_11, if x_11 were a sailor, then x_11 is listening to a song, and that there is at least one x_11 for which if x_11 listens to a song, then x_11 is excited we can infer that there is at least one x_11 for which if x_11 were a sailor, then x_11 is excited. From the fact that for all x_11, if x_11 were an office clerk, then x_11 is a sailor, that for all x_11, if x_11 drives a car, then x_11 is a sailor, and that for all x_11, x_11 is an office clerk or x_11 will drive a car we can infer that for all x_11, x_11 is a sailor. From the fact that there is at least one x_11 for which if x_11 were a sailor, then x_11 is excited, and that for all x_11, if x_11 were excited, then x_11 is climbing a mountain we can infer that there is at least one x_11 for which if x_11 were a sailor, then x_11 is climbing a mountain. Finally, from the fact that there is at least one x_11 for which if x_11 were a sailor, then x_11 is climbing a mountain, and that for all x_11, x_11 is a sailor we can infer that there is at least one x_11 for which x_11 will climb a mountain. Therefore, the answer is yes.