What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_9, if x_9 sleeps, then x_9 is a doctor. For all x_9, x_9 will not play squash. There is at least one x_9 for which x_9 will play squash if and only if x_9 is a doctor. For all x_9, if x_9 reads a book, then x_9 is sleeping.
For all x_9, if x_9 reads a book, then x_9 is a doctor. There is at least one x_9 for which if x_9 plays squash, then x_9 is a doctor. There is at least one x_9 for which if x_9 were a doctor, then x_9 is playing squash. There is at least one x_9 for which x_9 is not a doctor.