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