context: It is likely that Greg is gray. It is probably the case that Bill is in the school. There is a better than even chance that Bernhard is yellow. It is unlikely that if Greg is gray, or Bill is in the school, then Brian is a rhino. There is a very good chance that if Greg is gray, and Bernhard is yellow, then Sandra grabbed the milk. It is likely that if either Bill is in the school, or Greg is gray, then Julius is a swan.
hypothesis: There is little chance that julius is a swan, and Greg is gray.
valid_hypothesis: There is little chance that julius is a swan, and Greg is gray.
invalid_hypothesis: It is certain that julius is a swan, and Greg is gray.
hypothesis_assertion: Julius is a swan, and Greg is gray.