context: We doubt that Lily is yellow. It is probably the case that Mary moved to the garden. Chances are slight that Bill is in the kitchen. It is unlikely that if Lily is yellow, and Bill is in the kitchen, then Sandra left the apple. Chances are about even that if Lily is yellow, or Mary moved to the garden, then Greg is gray. There is a very good chance that if Mary moved to the garden, or Bill is in the kitchen, then Antoine is thirsty.
hypothesis: It is impossible that bill is in the kitchen, and Sandra left the apple.
valid_hypothesis: It is impossible that bill is in the kitchen, and Sandra left the apple.
invalid_hypothesis: There is a better than even chance that bill is in the kitchen, and Sandra left the apple.
hypothesis_assertion: Bill is in the kitchen, and Sandra left the apple.