context: Chances are about even that Lily is a swan. It is likely that Greg is white. It is highly unlikely that Brian is a rhino.
hypothesis: It is certain that either Brian is a rhino, or Lily is a swan.
valid_hypothesis: Chances are about even that either Brian is a rhino, or Lily is a swan.
invalid_hypothesis: It is certain that either Brian is a rhino, or Lily is a swan.
hypothesis_assertion: Either Brian is a rhino, or Lily is a swan.