What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If Charles listens to a song, then James is sleeping. It is not sunny. It is sunny if and only if it is late. James is sleeping if and only if it is late.
If it is sunny, then it is late. If James sleeps, then it is late. If it is late, then it is sunny. If it is late, then James is sleeping. It is not late.