context: It is likely that Sandra left the football. There is little chance that Julius is a swan. It is probable that Jason is hungry. It is probable that if Jason is hungry, and Julius is a swan, then Lily is white. There is almost no chance that if either Julius is a swan, or Jason is hungry, then Winona is a wolf. There is a very good chance that if Sandra left the football, or Julius is a swan, then Mary dropped the milk.
hypothesis: Chances are about even that either Julius is a swan, or Mary dropped the milk.
valid_hypothesis: Chances are about even that either Julius is a swan, or Mary dropped the milk.
invalid_hypothesis: It is almost certain that either Julius is a swan, or Mary dropped the milk.
hypothesis_assertion: Either Julius is a swan, or Mary dropped the milk.