What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? If it is cloudy, then Mary is reading a book. If Jessica plays squash, then it is cloudy. If Mary reads a book, then Jessica is playing squash. Jessica is not playing squash.
Mary is not reading a book. If it is cloudy, then Jessica is playing squash. If Jessica plays squash, then Mary is reading a book. If Mary reads a book, then it is cloudy.