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 for which if z drives a car, then z is a bartender. For all z, if z were a bartender, then z is driving a car.
There is at least one z for which z will drive a car if and only if z is a bartender. There is at least one z for which z is a bartender if and only if z will drive a car.