context: There is a better than even chance that Brian is a swan. It is certain that Julius is gray. It is almost certain that Greg is white.
hypothesis: It is improbable that julius is gray, or Greg is white.
valid_hypothesis: It is certain that julius is gray, or Greg is white.
invalid_hypothesis: It is improbable that julius is gray, or Greg is white.
hypothesis_assertion: Julius is gray, or Greg is white.