What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Jennifer is listening to a song if and only if Jessica is a lawyer. Jessica is a lawyer or Jennifer is not listening to a song.
If Jennifer listens to a song, then Jessica is a lawyer. If Jennifer listens to a song, then Jessica is a lawyer. If Jessica were a lawyer, then Jennifer is listening to a song.