context: It is improbable that Brian is yellow. Chances are about even that Lily is a swan. It is highly likely that Bernhard is a swan.
hypothesis: It is certain that either Lily is a swan, or Bernhard is a swan.
valid_hypothesis: Chances are about even that either Lily is a swan, or Bernhard is a swan.
invalid_hypothesis: It is certain that either Lily is a swan, or Bernhard is a swan.
hypothesis_assertion: Either Lily is a swan, or Bernhard is a swan.