context: It is almost certain that John got the milk. We believe that Brian is white. It is impossible that Julius is gray.
hypothesis: It is highly likely that either Brian is white, or John got the milk.
valid_hypothesis: It is probably not the case that either Brian is white, or John got the milk.
invalid_hypothesis: It is highly likely that either Brian is white, or John got the milk.
hypothesis_assertion: Either Brian is white, or John got the milk.