context: A guy riding a motorcycle near junk cars
hypothesis: It is impossible that the man is test driving a motorcycle to decide whether or not he will buy it.
valid_hypothesis: It is impossible that the man is test driving a motorcycle to decide whether or not he will buy it.
invalid_hypothesis: There is a better than even chance that the man is test driving a motorcycle to decide whether or not he will buy it.
hypothesis_assertion: The man is test driving a motorcycle to decide whether or not he will buy it.