context: Chances are slight that Brian is a rhino. We doubt that John went to the garden. It is highly likely that Greg is green. We doubt that if Brian is a rhino, or Greg is green, then Lily is a lion. It is highly unlikely that if Greg is green, or Brian is a rhino, then Bernhard is a rhino. It is certain that if Greg is green, and John went to the garden, then Winona is a wolf.
hypothesis: It is probably not the case that either John went to the garden, or Brian is a rhino.
valid_hypothesis: It is probably not the case that either John went to the garden, or Brian is a rhino.
invalid_hypothesis: It is certain that either John went to the garden, or Brian is a rhino.
hypothesis_assertion: Either John went to the garden, or Brian is a rhino.