context: It is almost certain that Brian is white. There is a very good chance that Lily is a swan. It is impossible that Daniel got the football.
hypothesis: There is a very good chance that either Brian is white, or Lily is a swan.
valid_hypothesis: It is probably not the case that either Brian is white, or Lily is a swan.
invalid_hypothesis: There is a very good chance that either Brian is white, or Lily is a swan.
hypothesis_assertion: Either Brian is white, or Lily is a swan.