Consider the following premises. For all x_4, x_4 is not happy. For all x_4, x_4 is happy or x_4 is a scientist. There is at least one x_4 for which x_4 is not a scientist or x_4 will drive a car. Can we infer the following from them? There is at least one x_4 for which x_4 is an electrician or x_4 will drive a car.
 From the fact that for all x_4, x_4 is happy or x_4 is a scientist, and that for all x_4, x_4 is not happy we can infer that for all x_4, x_4 is a scientist. From the fact that for all x_4, x_4 is a scientist we can infer that for all x_4, x_4 is a scientist or x_4 is an electrician. Finally, from the fact that for all x_4, x_4 is a scientist or x_4 is an electrician, and that there is at least one x_4 for which x_4 is not a scientist or x_4 will drive a car we can infer that there is at least one x_4 for which x_4 is an electrician or x_4 will drive a car. Therefore, the answer is yes.