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, if x_8 reads a book, then x_8 is a janitor. For all x_8, x_8 is a cashier if and only if x_8 is a janitor. There is at least one x_8 for which x_8 is not a cashier.
For all x_8, if x_8 were a cashier, then x_8 is a janitor. For all x_8, if x_8 were a janitor, then x_8 is a cashier. There is at least one x_8 for which x_8 is not a janitor.