context: It is probably not the case that Greg is green. It is certain that Julius is a swan. Chances are about even that John went to the kitchen. It is highly likely that if either John went to the kitchen, or Julius is a swan, then Brian is a frog. It is certain that if either John went to the kitchen, or Julius is a swan, then Lily is a lion. It is probable that if Greg is green, and Julius is a swan, then Mary moved to the office.
hypothesis: There is little chance that either Julius is a swan, or Brian is a frog.
valid_hypothesis: There is a better than even chance that either Julius is a swan, or Brian is a frog.
invalid_hypothesis: There is little chance that either Julius is a swan, or Brian is a frog.
hypothesis_assertion: Either Julius is a swan, or Brian is a frog.