context: Chances are slight that Sandra left the milk. There is a better than even chance that Julius is yellow. We believe that John dropped the apple. It is highly likely that if Sandra left the milk, and Julius is yellow, then Brian is a frog. It is probably not the case that if John dropped the apple, and Sandra left the milk, then Bill went to the hallway. It is unlikely that if Sandra left the milk, and Julius is yellow, then Bernhard is a rhino.
hypothesis: Chances are about even that bill went to the hallway, and Sandra left the milk.
valid_hypothesis: There is almost no chance that bill went to the hallway, and Sandra left the milk.
invalid_hypothesis: Chances are about even that bill went to the hallway, and Sandra left the milk.
hypothesis_assertion: Bill went to the hallway, and Sandra left the milk.