context: We believe that Winona is a cat. It is highly unlikely that Greg is a swan. It is almost certain that Jessica is a sheep. Chances are about even that if either Winona is a cat, or Greg is a swan, then Brian is white. It is highly likely that if Greg is a swan, or Winona is a cat, then Mary took the apple. There is almost no chance that if either Greg is a swan, or Jessica is a sheep, then Lily is gray.
hypothesis: It is impossible that lily is gray, and Brian is white.
valid_hypothesis: It is impossible that lily is gray, and Brian is white.
invalid_hypothesis: We believe that lily is gray, and Brian is white.
hypothesis_assertion: Lily is gray, and Brian is white.