What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_10, if x_10 reads a book, then x_10 is working. For all x_10, x_10 will not work. If it is overcast, then David is a cashier. For all x_10, x_10 is a cashier if and only if x_10 will read a book.
For all x_10, x_10 will not read a book. For all x_10, if x_10 were a cashier, then x_10 is reading a book. For all x_10, if x_10 reads a book, then x_10 is a cashier.