context: a man plays his guitar on the street.
hypothesis: There is a better than even chance that the man is playing his guitar and singing on the street.
valid_hypothesis: There is a better than even chance that the man is playing his guitar and singing on the street.
invalid_hypothesis: There is almost no chance that the man is playing his guitar and singing on the street.
hypothesis_assertion: The man is playing his guitar and singing on the street.