context: Chances are slight that Greg is a swan. There is a better than even chance that Lily is yellow. It is likely that Brian is green. Chances are about even that if either Brian is green, or Greg is a swan, then Jeff dropped the apple. There is a very good chance that if Greg is a swan, and Brian is green, then Winona is a mouse. There is little chance that if either Greg is a swan, or Brian is green, then Bernhard is a lion.
hypothesis: It is impossible that jeff dropped the apple, and Winona is a mouse.
valid_hypothesis: It is impossible that jeff dropped the apple, and Winona is a mouse.
invalid_hypothesis: It is certain that jeff dropped the apple, and Winona is a mouse.
hypothesis_assertion: Jeff dropped the apple, and Winona is a mouse.