context: It is certain that Brian is a swan. It is certain that Lily is gray. It is improbable that Julius is a rhino.
hypothesis: It is impossible that either Brian is a swan, or Lily is gray.
valid_hypothesis: It is impossible that either Brian is a swan, or Lily is gray.
invalid_hypothesis: It is likely that either Brian is a swan, or Lily is gray.
hypothesis_assertion: Either Brian is a swan, or Lily is gray.