context: Chances are about even that Lily is green. It is probably not the case that Brian is a swan. It is likely that Sandra left the football.
hypothesis: It is improbable that lily is green, and Brian is a swan.
valid_hypothesis: It is improbable that lily is green, and Brian is a swan.
invalid_hypothesis: There is a very good chance that lily is green, and Brian is a swan.
hypothesis_assertion: Lily is green, and Brian is a swan.