What can be inferred from the following premises in a single inference step (ignoring inferences that add new predicates or constants)? Richard is drinking water or Joseph is a writer. For all x_10, if x_10 drinks water, then x_10 is climbing a mountain. For all x_10, if x_10 climbs a mountain, then x_10 is drinking water. If Joseph were a writer, then Richard is climbing a mountain.
For all x_10, x_10 will drink water if and only if x_10 will climb a mountain. For all x_10, x_10 will climb a mountain if and only if x_10 will drink water.