context: There is a very good chance that Brian is a swan. Chances are slight that Julius is gray. It is almost certain that Lily is green. It is probable that if Julius is gray, and Brian is a swan, then Greg is a rhino. It is highly unlikely that if Brian is a swan, or Lily is green, then Bernhard is green. We doubt that if Brian is a swan, and Lily is green, then Gertrude is a mouse.
hypothesis: It is unlikely that either Greg is a rhino, or Brian is a swan.
valid_hypothesis: We believe that either Greg is a rhino, or Brian is a swan.
invalid_hypothesis: It is unlikely that either Greg is a rhino, or Brian is a swan.
hypothesis_assertion: Either Greg is a rhino, or Brian is a swan.