context: A curly-haired man and a woman in a black tank top both play guitars and sing at a festival.
hypothesis: There is almost no chance that a brother and sister are playing in their band at a festival.
valid_hypothesis: There is almost no chance that a brother and sister are playing in their band at a festival.
invalid_hypothesis: It is likely that a brother and sister are playing in their band at a festival.
hypothesis_assertion: A brother and sister are playing in their band at a festival.