context: It is improbable that Bernhard is white. It is highly unlikely that Brian is a swan. It is improbable that Lily is white.
hypothesis: We believe that either Brian is a swan, or Bernhard is white.
valid_hypothesis: There is little chance that either Brian is a swan, or Bernhard is white.
invalid_hypothesis: We believe that either Brian is a swan, or Bernhard is white.
hypothesis_assertion: Either Brian is a swan, or Bernhard is white.