context: It is unlikely that John left the milk. It is unlikely that Greg is a lion. There is almost no chance that Mary dropped the apple. It is probable that if Mary dropped the apple, or John left the milk, then Lily is yellow. We doubt that if Mary dropped the apple, or Greg is a lion, then Sandra grabbed the milk. There is a better than even chance that if either John left the milk, or Mary dropped the apple, then Bernhard is a swan.
hypothesis: It is impossible that sandra grabbed the milk, and Mary dropped the apple.
valid_hypothesis: It is impossible that sandra grabbed the milk, and Mary dropped the apple.
invalid_hypothesis: It is probably the case that sandra grabbed the milk, and Mary dropped the apple.
hypothesis_assertion: Sandra grabbed the milk, and Mary dropped the apple.