context: It is unlikely that John put down the milk. It is highly likely that Brian is a swan. There is little chance that Mary moved to the garden. There is a better than even chance that if Brian is a swan, or John put down the milk, then Jason is bored. It is highly likely that if Mary moved to the garden, and Brian is a swan, then Lily is green. It is probable that if Brian is a swan, or John put down the milk, then Julius is gray.
hypothesis: It is likely that either Brian is a swan, or Julius is gray.
valid_hypothesis: It is probably not the case that either Brian is a swan, or Julius is gray.
invalid_hypothesis: It is likely that either Brian is a swan, or Julius is gray.
hypothesis_assertion: Either Brian is a swan, or Julius is gray.