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 climbing a mountain. For all y, if y listens to a song, then y is not driving a car. There is at least one y for which if y climbs a mountain, then y is listening to a song. For all y, y will drive a car.
For all y, y will not listen to a song. There is at least one y for which y will climb a mountain 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 climb a mountain.