context: We believe that John got the milk. It is highly unlikely that Mary went to the office. There is a better than even chance that Brian is a rhino. It is unlikely that if Brian is a rhino, or John got the milk, then Daniel dropped the apple. It is probably not the case that if either Brian is a rhino, or John got the milk, then Bernhard is gray. There is little chance that if John got the milk, and Brian is a rhino, then Lily is a frog.
hypothesis: Chances are slight that brian is a rhino, or Mary went to the office.
valid_hypothesis: There is a better than even chance that brian is a rhino, or Mary went to the office.
invalid_hypothesis: Chances are slight that brian is a rhino, or Mary went to the office.
hypothesis_assertion: Brian is a rhino, or Mary went to the office.