context: It is highly likely that Fred went to the kitchen. There is a very good chance that Julius is a swan. It is improbable that Lily is white.
hypothesis: We believe that either Julius is a swan, or Lily is white.
valid_hypothesis: We believe that either Julius is a swan, or Lily is white.
invalid_hypothesis: It is probably not the case that either Julius is a swan, or Lily is white.
hypothesis_assertion: Either Julius is a swan, or Lily is white.