context: There is almost no chance that Mary dropped the milk. Chances are about even that Lily is yellow. We believe that Brian is a frog. There is a very good chance that if either Brian is a frog, or Mary dropped the milk, then Greg is a lion. It is highly likely that if Brian is a frog, and Lily is yellow, then Bill went to the kitchen. It is unlikely that if Mary dropped the milk, and Brian is a frog, then John got the apple.
hypothesis: It is impossible that mary dropped the milk, and John got the apple.
valid_hypothesis: It is impossible that mary dropped the milk, and John got the apple.
invalid_hypothesis: It is almost certain that mary dropped the milk, and John got the apple.
hypothesis_assertion: Mary dropped the milk, and John got the apple.