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 x for which x will listen to a song if and only if x will climb a mountain. For all x, x will climb a mountain or x will not listen to a song.
For all x, if x listens to a song, then x is climbing a mountain. There is at least one x for which if x listens to a song, then x is climbing a mountain. There is at least one x for which if x climbs a mountain, then x is listening to a song.