context: There is little chance that Julius is a rhino. Chances are about even that Brian is gray. Chances are about even that Mary dropped the milk.
hypothesis: It is probably not the case that mary dropped the milk, and Brian is gray.
valid_hypothesis: It is probably not the case that mary dropped the milk, and Brian is gray.
invalid_hypothesis: It is probable that mary dropped the milk, and Brian is gray.
hypothesis_assertion: Mary dropped the milk, and Brian is gray.