What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_12, x_12 will not work. There is at least one x_12 for which x_12 will drive a car if and only if x_12 is a janitor. For all x_12, if x_12 reads a book, then x_12 is driving a car. For all x_12, x_12 is a janitor if and only if x_12 will work.
For all x_12, if x_12 were a janitor, then x_12 is working. There is at least one x_12 for which if x_12 drives a car, then x_12 is a janitor. For all x_12, if x_12 works, then x_12 is a janitor. There is at least one x_12 for which if x_12 were a janitor, then x_12 is driving a car. For all x_12, x_12 is not a janitor.