context: A man who has a gray beard and gray hair laughs while wearing a purple shirt.
hypothesis: It is impossible that a man is laughing at a woman who has fallen over.
valid_hypothesis: It is impossible that a man is laughing at a woman who has fallen over.
invalid_hypothesis: It is almost certain that a man is laughing at a woman who has fallen over.
hypothesis_assertion: A man is laughing at a woman who has fallen over.