context: It is probable that Lily is a swan. It is probable that Winona is a sheep. It is highly likely that Brian is white.
hypothesis: It is impossible that winona is a sheep, and Lily is a swan.
valid_hypothesis: Chances are about even that winona is a sheep, and Lily is a swan.
invalid_hypothesis: It is impossible that winona is a sheep, and Lily is a swan.
hypothesis_assertion: Winona is a sheep, and Lily is a swan.