Consider the following premises. For all x_8, x_8 will go running if and only if x_8 will sleep. For all x_8, x_8 will not sleep. For all x_8, x_8 will read a book if and only if x_8 will go running. For all x_8, x_8 will read a book if and only if x_8 is a nurse. Can we infer the following from them? There is at least one x_8 for which x_8 is a nurse.
 From the fact that for all x_8, x_8 will go running if and only if x_8 will sleep, and that for all x_8, x_8 will not sleep we can infer that for all x_8, x_8 will not go running. From the fact that for all x_8, x_8 will read a book if and only if x_8 will go running, and that for all x_8, x_8 will not go running we can infer that for all x_8, x_8 will not read a book. Finally, from the fact that for all x_8, x_8 will read a book if and only if x_8 is a nurse, and that for all x_8, x_8 will not read a book we can infer that for all x_8, x_8 is not a nurse, which contradicts that There is at least one x_8 for which x_8 is a nurse. Therefore, the answer is no.