Consider the following premises. For all x_15, if x_15 were an office clerk, then x_15 is listening to a song. For all x_15, if x_15 works, then x_15 is listening to a song. For all x_15, x_15 is an office clerk or x_15 will take a plane. For all x_15, x_15 will work if and only if x_15 will take a plane. There is at least one x_15 for which if x_15 listens to a song, then x_15 is an office clerk. Can we infer the following from them? For all x_15, x_15 will not listen to a song.
 From the fact that for all x_15, if x_15 were an office clerk, then x_15 is listening to a song, and that there is at least one x_15 for which if x_15 listens to a song, then x_15 is an office clerk we can infer that there is at least one x_15 for which x_15 is an office clerk if and only if x_15 will listen to a song. From the fact that there is at least one x_15 for which x_15 is an office clerk if and only if x_15 will listen to a song we can infer that there is at least one x_15 for which if x_15 were an office clerk, then x_15 is listening to a song. From the fact that for all x_15, x_15 will work if and only if x_15 will take a plane we can infer that for all x_15, if x_15 takes a plane, then x_15 is working. From the fact that for all x_15, if x_15 takes a plane, then x_15 is working, and that for all x_15, if x_15 works, then x_15 is listening to a song we can infer that for all x_15, if x_15 takes a plane, then x_15 is listening to a song. Finally, from the fact that there is at least one x_15 for which if x_15 were an office clerk, then x_15 is listening to a song, that for all x_15, if x_15 takes a plane, then x_15 is listening to a song, and that for all x_15, x_15 is an office clerk or x_15 will take a plane we can infer that there is at least one x_15 for which x_15 will listen to a song, which contradicts that For all x_15, x_15 will not listen to a song. Therefore, the answer is no.