What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? James is not a police officer. If it snows, then William is listening to a song. If James were a police officer, then it is snowing. James is a police officer or William is not listening to a song.
If James were a police officer, then William is listening to a song. William is not listening to a song. If William listens to a song, then James is a police officer.