What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_8, x_8 is a nurse if and only if x_8 will work. For all x_8, x_8 is a janitor if and only if x_8 is a nurse. For all x_8, x_8 is not a janitor.
For all x_8, if x_8 were a nurse, then x_8 is working. For all x_8, if x_8 were a janitor, then x_8 is a nurse. For all x_8, if x_8 works, then x_8 is a nurse. For all x_8, if x_8 were a nurse, then x_8 is a janitor. For all x_8, x_8 is not a nurse.