context: It is impossible that Fred went to the office. It is probably the case that Bernhard is white. It is unlikely that Brian is gray.
hypothesis: Chances are slight that either Bernhard is white, or Brian is gray.
valid_hypothesis: There is a better than even chance that either Bernhard is white, or Brian is gray.
invalid_hypothesis: Chances are slight that either Bernhard is white, or Brian is gray.
hypothesis_assertion: Either Bernhard is white, or Brian is gray.