Consider the following premises. For all x_15, if x_15 sleeps, then x_15 is driving a car. For all x_15, x_15 will not go running or x_15 is a scientist. There is at least one x_15 for which if x_15 drives a car, then x_15 is fast. For all x_15, if x_15 were a scientist, then x_15 is fast. For all x_15, x_15 will go running or x_15 is an electrician. For all x_15, x_15 will sleep if and only if x_15 is an electrician. Can we infer the following from them? There is at least one x_15 for which x_15 is fast.
 From the fact that for all x_15, x_15 will go running or x_15 is an electrician, and that for all x_15, x_15 will not go running or x_15 is a scientist we can infer that for all x_15, x_15 is an electrician or x_15 is a scientist. From the fact that for all x_15, x_15 will sleep if and only if x_15 is an electrician we can infer that for all x_15, if x_15 were an electrician, then x_15 is sleeping. From the fact that for all x_15, if x_15 were an electrician, then x_15 is sleeping, and that for all x_15, if x_15 sleeps, then x_15 is driving a car we can infer that for all x_15, if x_15 were an electrician, then x_15 is driving a car. From the fact that for all x_15, if x_15 were an electrician, then x_15 is driving a car, and that there is at least one x_15 for which if x_15 drives a car, then x_15 is fast we can infer that there is at least one x_15 for which if x_15 were an electrician, then x_15 is fast. Finally, from the fact that there is at least one x_15 for which if x_15 were an electrician, then x_15 is fast, that for all x_15, if x_15 were a scientist, then x_15 is fast, and that for all x_15, x_15 is an electrician or x_15 is a scientist we can infer that there is at least one x_15 for which x_15 is fast. Therefore, the answer is yes.