context: It is certain that Julius is a rhino. There is a better than even chance that Bernhard is gray. We believe that Greg is a frog. It is unlikely that if Bernhard is gray, or Greg is a frog, then Lily is white. It is certain that if either Julius is a rhino, or Bernhard is gray, then Brian is a swan. We doubt that if Bernhard is gray, or Greg is a frog, then John went to the garden.
hypothesis: Chances are about even that either Brian is a swan, or John went to the garden.
valid_hypothesis: Chances are about even that either Brian is a swan, or John went to the garden.
invalid_hypothesis: It is certain that either Brian is a swan, or John went to the garden.
hypothesis_assertion: Either Brian is a swan, or John went to the garden.