Consider the following premises. For all x_5, x_5 will sleep. There is at least one x_5 for which if x_5 sleeps, then x_5 is a scientist. For all x_5, x_5 is a taxi driver. Can we infer the following from them? There is at least one x_5 for which x_5 is a scientist.
 From the fact that for all x_5, x_5 will sleep, and that for all x_5, x_5 is a taxi driver we can infer that for all x_5, x_5 will sleep and x_5 is a taxi driver. From the fact that for all x_5, x_5 will sleep and x_5 is a taxi driver we can infer that for all x_5, x_5 will sleep. Finally, from the fact that there is at least one x_5 for which if x_5 sleeps, then x_5 is a scientist, and that for all x_5, x_5 will sleep we can infer that there is at least one x_5 for which x_5 is a scientist. Therefore, the answer is yes.