What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? There is at least one z_1 for which z_1 is a nurse or z_1 will not drive a car. For all z_1, if z_1 were a nurse, then z_1 is sleeping. For all z_1, z_1 will drive a car if and only if z_1 will sleep.
There is at least one z_1 for which if z_1 drives a car, then z_1 is a nurse. For all z_1, if z_1 drives a car, then z_1 is sleeping. For all z_1, if z_1 sleeps, then z_1 is driving a car.