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, x_9 will read a book if and only if x_9 will climb a mountain. If Patricia plays tennis, then John is reading a book. John is climbing a mountain or Patricia is playing tennis.
For all x_9, if x_9 reads a book, then x_9 is climbing a mountain. For all x_9, if x_9 climbs a mountain, then x_9 is reading a book.