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