context: It is unlikely that Fred is in the school. We believe that Greg is a frog. Chances are about even that Mary went to the office. It is almost certain that if either Greg is a frog, or Fred is in the school, then Lily is a swan. There is little chance that if Greg is a frog, or Mary went to the office, then Sandra grabbed the milk. It is impossible that if Mary went to the office, and Greg is a frog, then Bernhard is a frog.
hypothesis: It is certain that sandra grabbed the milk, and Bernhard is a frog.
valid_hypothesis: It is impossible that sandra grabbed the milk, and Bernhard is a frog.
invalid_hypothesis: It is certain that sandra grabbed the milk, and Bernhard is a frog.
hypothesis_assertion: Sandra grabbed the milk, and Bernhard is a frog.