context: It is probably the case that Mary got the milk. There is a better than even chance that Lily is a swan. It is likely that Julius is white. We doubt that if Julius is white, or Mary got the milk, then Brian is a lion. It is highly unlikely that if Julius is white, and Mary got the milk, then Bernhard is gray. Chances are about even that if Lily is a swan, and Mary got the milk, then John went to the kitchen.
hypothesis: Chances are slight that lily is a swan, or John went to the kitchen.
valid_hypothesis: There is a better than even chance that lily is a swan, or John went to the kitchen.
invalid_hypothesis: Chances are slight that lily is a swan, or John went to the kitchen.
hypothesis_assertion: Lily is a swan, or John went to the kitchen.