context: It is probably not the case that Brian is a frog. There is little chance that Lily is a swan. There is almost no chance that Sandra left the football.
hypothesis: It is probable that sandra left the football, and Brian is a frog.
valid_hypothesis: It is impossible that sandra left the football, and Brian is a frog.
invalid_hypothesis: It is probable that sandra left the football, and Brian is a frog.
hypothesis_assertion: Sandra left the football, and Brian is a frog.