Consider the following premises. For all x_5, if x_5 were a doctor, then x_5 is playing squash. For all x_5, if x_5 plays squash, then x_5 is sleeping. For all x_5, if x_5 sleeps, then x_5 is reading a book. For all x_5, x_5 will not read a book. Can we infer the following from them? There is at least one x_5 for which x_5 is a doctor.
 From the fact that for all x_5, if x_5 plays squash, then x_5 is sleeping, and that for all x_5, if x_5 sleeps, then x_5 is reading a book we can infer that for all x_5, if x_5 plays squash, then x_5 is reading a book. From the fact that for all x_5, if x_5 plays squash, then x_5 is reading a book, and that for all x_5, x_5 will not read a book we can infer that for all x_5, x_5 will not play squash. Finally, from the fact that for all x_5, if x_5 were a doctor, then x_5 is playing squash, and that for all x_5, x_5 will not play squash we can infer that for all x_5, x_5 is not a doctor, which contradicts that There is at least one x_5 for which x_5 is a doctor. Therefore, the answer is no.