context: It is highly unlikely that Bernhard is a swan. It is unlikely that Winona is a wolf. It is impossible that Daniel took the milk. It is almost certain that if Bernhard is a swan, or Winona is a wolf, then Lily is a lion. There is a better than even chance that if either Bernhard is a swan, or Daniel took the milk, then Brian is white. It is highly unlikely that if Daniel took the milk, or Bernhard is a swan, then Fred is in the school.
hypothesis: There is a very good chance that brian is white, or Fred is in the school.
valid_hypothesis: There is almost no chance that brian is white, or Fred is in the school.
invalid_hypothesis: There is a very good chance that brian is white, or Fred is in the school.
hypothesis_assertion: Brian is white, or Fred is in the school.