context: There is little chance that Jessica is a mouse. There is little chance that Mary went to the hallway. It is likely that Bill moved to the office. It is likely that if Mary went to the hallway, and Bill moved to the office, then Brian is gray. It is probable that if either Bill moved to the office, or Jessica is a mouse, then Sandra took the apple. It is likely that if Jessica is a mouse, and Bill moved to the office, then Bernhard is white.
hypothesis: It is certain that sandra took the apple, and Bill moved to the office.
valid_hypothesis: Chances are about even that sandra took the apple, and Bill moved to the office.
invalid_hypothesis: It is certain that sandra took the apple, and Bill moved to the office.
hypothesis_assertion: Sandra took the apple, and Bill moved to the office.