What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? For all x_7, x_7 will climb a mountain or x_7 will drink water. For all x_7, x_7 is a taxi driver. For all x_7, if x_7 climbs a mountain, then x_7 is reading a book. For all x_7, x_7 will drink water if and only if x_7 will read a book.
For all x_7, if x_7 drinks water, then x_7 is reading a book. For all x_7, if x_7 reads a book, then x_7 is drinking water.