context: Chances are slight that John discarded the milk. Chances are slight that Julius is gray. We doubt that Brian is a swan. There is a better than even chance that if either Julius is gray, or John discarded the milk, then Mary went to the kitchen. We doubt that if either Julius is gray, or John discarded the milk, then Sandra got the football. There is little chance that if John discarded the milk, and Brian is a swan, then Lily is a lion.
hypothesis: It is almost certain that either Julius is gray, or Brian is a swan.
valid_hypothesis: It is probably not the case that either Julius is gray, or Brian is a swan.
invalid_hypothesis: It is almost certain that either Julius is gray, or Brian is a swan.
hypothesis_assertion: Either Julius is gray, or Brian is a swan.