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