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 y for which y will listen to a song or y will go running. For all y, y will listen to a song if and only if y will play tennis. For all y, y will play tennis or y will not go running.
For all y, if y goes running, then y is playing tennis. For all y, if y listens to a song, then y is playing tennis. For all y, if y plays tennis, then y is listening to a song.