context: It is unlikely that Lily is gray. Chances are slight that Brian is a swan. It is impossible that Julius is gray.
hypothesis: There is almost no chance that brian is a swan, and Lily is gray.
valid_hypothesis: There is almost no chance that brian is a swan, and Lily is gray.
invalid_hypothesis: We believe that brian is a swan, and Lily is gray.
hypothesis_assertion: Brian is a swan, and Lily is gray.