context: Chances are about even that Brian is gray. It is highly unlikely that Greg is gray. It is unlikely that Daniel took the apple.
hypothesis: It is impossible that either Greg is gray, or Brian is gray.
valid_hypothesis: Chances are about even that either Greg is gray, or Brian is gray.
invalid_hypothesis: It is impossible that either Greg is gray, or Brian is gray.
hypothesis_assertion: Either Greg is gray, or Brian is gray.