What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Michael is running if and only if Robert is listening to a song. David is a bartender. Robert is listening to a song.
David is a bartender and Robert is listening to a song. Robert is listening to a song and David is a bartender. If Michael goes running, then Robert is listening to a song. If Robert listens to a song, then Michael is running.