context: Four men in red vests with crosses on them ski on a mountain.
hypothesis: It is impossible that four men are racing down a mountain on skis while wearing colorful red vests.
valid_hypothesis: It is impossible that four men are racing down a mountain on skis while wearing colorful red vests.
invalid_hypothesis: Chances are about even that four men are racing down a mountain on skis while wearing colorful red vests.
hypothesis_assertion: Four men are racing down a mountain on skis while wearing colorful red vests.