context: There is a better than even chance that Brian is a swan. There is almost no chance that John went to the hallway. It is probably the case that Daniel put down the milk. It is highly likely that if Daniel put down the milk, and John went to the hallway, then Greg is a lion. It is certain that if Brian is a swan, and John went to the hallway, then Mary took the apple. It is likely that if either Brian is a swan, or Daniel put down the milk, then Lily is green.
hypothesis: Chances are slight that brian is a swan, and Lily is green.
valid_hypothesis: Chances are slight that brian is a swan, and Lily is green.
invalid_hypothesis: It is probable that brian is a swan, and Lily is green.
hypothesis_assertion: Brian is a swan, and Lily is green.