What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_9, if x_9 works, then x_9 is a mechanic. For all x_9, if x_9 reads a book, then x_9 is a cashier. For all x_9, x_9 will drive a car or x_9 will read a book. There is at least one x_9 for which if x_9 were a cashier, then x_9 is working. For all x_9, if x_9 drives a car, then x_9 is a cashier.
There is at least one x_9 for which if x_9 were a cashier, then x_9 is a mechanic. There is at least one x_9 for which if x_9 reads a book, then x_9 is working. There is at least one x_9 for which if x_9 drives a car, then x_9 is working. For all x_9, x_9 is a cashier.