context: There is almost no chance that Lily is a swan. It is impossible that Sandra got the football. It is probable that Brian is a frog.
hypothesis: It is impossible that brian is a frog, and Sandra got the football.
valid_hypothesis: It is impossible that brian is a frog, and Sandra got the football.
invalid_hypothesis: It is likely that brian is a frog, and Sandra got the football.
hypothesis_assertion: Brian is a frog, and Sandra got the football.