context: A man is on the back of his friend.
hypothesis: There is a better than even chance that a man is on the back of his friend in the swimming pool.
valid_hypothesis: It is impossible that a man is on the back of his friend in the swimming pool.
invalid_hypothesis: There is a better than even chance that a man is on the back of his friend in the swimming pool.
hypothesis_assertion: A man is on the back of his friend in the swimming pool.