context: It is probably not the case that John moved to the office. It is highly likely that Fred is in the school. It is highly likely that Bernhard is green. There is little chance that if Fred is in the school, and Bernhard is green, then Sandra got the milk. We doubt that if Bernhard is green, or Fred is in the school, then Brian is yellow. It is highly likely that if either Bernhard is green, or John moved to the office, then Greg is a swan.
hypothesis: It is impossible that fred is in the school, and Greg is a swan.
valid_hypothesis: There is a better than even chance that fred is in the school, and Greg is a swan.
invalid_hypothesis: It is impossible that fred is in the school, and Greg is a swan.
hypothesis_assertion: Fred is in the school, and Greg is a swan.