What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all z_1, z_1 will read a book if and only if z_1 will drive a car. For all z_1, if z_1 reads a book, then z_1 is driving a car.
For all z_1, if z_1 reads a book, then z_1 is driving a car. For all z_1, if z_1 drives a car, then z_1 is reading a book.