What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If John listens to a song, then Mary is running. Sarah is playing a game if and only if John is listening to a song. If Mary goes running, then John is listening to a song.
John is listening to a song if and only if Mary is running. Mary is running if and only if John is listening to a song. If Sarah plays a game, then John is listening to a song. If John listens to a song, then Sarah is playing a game.