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