What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Joseph listens to a song, then it is windy. If Charles were a police officer, then Joseph is listening to a song. It is windy if and only if Charles is a police officer.
If Charles were a police officer, then it is windy. If it is windy, then Charles is a police officer. If Charles were a police officer, then it is windy.