context: An man wearing headphones observes an older man performing his guitar on a public street bench.
hypothesis: There is almost no chance that one man is listening to rap music while the older man is playing rock music
valid_hypothesis: There is almost no chance that one man is listening to rap music while the older man is playing rock music
invalid_hypothesis: It is likely that one man is listening to rap music while the older man is playing rock music
hypothesis_assertion: One man is listening to rap music while the older man is playing rock music