context: We doubt that Brian is green. It is highly unlikely that Greg is gray. It is improbable that John grabbed the milk. There is a very good chance that if John grabbed the milk, and Brian is green, then Lily is yellow. Chances are about even that if John grabbed the milk, or Greg is gray, then Bernhard is a frog. There is a very good chance that if Brian is green, or Greg is gray, then Jeff went to the garden.
hypothesis: It is probably not the case that either Brian is green, or Bernhard is a frog.
valid_hypothesis: It is probably not the case that either Brian is green, or Bernhard is a frog.
invalid_hypothesis: There is a very good chance that either Brian is green, or Bernhard is a frog.
hypothesis_assertion: Either Brian is green, or Bernhard is a frog.