Consider the following premises. For all x_4, x_4 is an electrician or x_4 will drive a car. For all x_4, if x_4 were an electrician, then x_4 is listening to a song. For all x_4, x_4 will listen to a song if and only if x_4 will drive a car. Can we infer the following from them? There is at least one x_4 for which x_4 will not listen to a song.
 From the fact that for all x_4, x_4 will listen to a song if and only if x_4 will drive a car we can infer that for all x_4, if x_4 drives a car, then x_4 is listening to a song. Finally, from the fact that for all x_4, if x_4 were an electrician, then x_4 is listening to a song, that for all x_4, if x_4 drives a car, then x_4 is listening to a song, and that for all x_4, x_4 is an electrician or x_4 will drive a car we can infer that for all x_4, x_4 will listen to a song, which contradicts that There is at least one x_4 for which x_4 will not listen to a song. Therefore, the answer is no.