context: Chances are slight that Greg is gray. It is almost certain that John took the apple. It is certain that Bernhard is yellow. It is highly likely that if either Bernhard is yellow, or John took the apple, then Brian is a swan. There is a very good chance that if John took the apple, or Bernhard is yellow, then Lily is a lion. There is a very good chance that if either Bernhard is yellow, or Greg is gray, then Winona is a wolf.
hypothesis: Chances are slight that brian is a swan, or Greg is gray.
valid_hypothesis: Chances are slight that brian is a swan, or Greg is gray.
invalid_hypothesis: It is almost certain that brian is a swan, or Greg is gray.
hypothesis_assertion: Brian is a swan, or Greg is gray.