context: There is a better than even chance that Brian is gray. It is highly unlikely that Julius is a swan. Chances are about even that Winona is a cat. There is a very good chance that if Julius is a swan, and Winona is a cat, then Bernhard is a frog. It is improbable that if Brian is gray, or Winona is a cat, then Fred went to the cinema. It is certain that if either Brian is gray, or Julius is a swan, then Sandra got the apple.
hypothesis: It is highly likely that either Fred went to the cinema, or Bernhard is a frog.
valid_hypothesis: Chances are slight that either Fred went to the cinema, or Bernhard is a frog.
invalid_hypothesis: It is highly likely that either Fred went to the cinema, or Bernhard is a frog.
hypothesis_assertion: Either Fred went to the cinema, or Bernhard is a frog.