What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all y, if y listens to a song, then y is driving a car. There is at least one y for which if y drives a car, then y is listening to a song.
There is at least one y for which y will drive a car if and only if y will listen to a song. There is at least one y for which y will listen to a song if and only if y will drive a car.