context: Chances are slight that Lily is white. It is improbable that Brian is gray. We doubt that Bernhard is a frog.
hypothesis: There is almost no chance that brian is gray, and Lily is white.
valid_hypothesis: There is almost no chance that brian is gray, and Lily is white.
invalid_hypothesis: There is a very good chance that brian is gray, and Lily is white.
hypothesis_assertion: Brian is gray, and Lily is white.