context: A group of mountain climbers rests at the summit.
hypothesis: It is impossible that a group of climbers celebrates at the top of Everest.
valid_hypothesis: It is impossible that a group of climbers celebrates at the top of Everest.
invalid_hypothesis: It is certain that a group of climbers celebrates at the top of Everest.
hypothesis_assertion: A group of climbers celebrates at the top of Everest.