context: It is likely that Lily is white. It is highly unlikely that Brian is gray. Chances are slight that Greg is a swan. It is highly unlikely that if Lily is white, or Brian is gray, then Fred is in the bedroom. There is almost no chance that if Lily is white, or Brian is gray, then John moved to the office. It is probably the case that if either Greg is a swan, or Lily is white, then Bill went to the kitchen.
hypothesis: Chances are about even that lily is white, and Bill went to the kitchen.
valid_hypothesis: Chances are about even that lily is white, and Bill went to the kitchen.
invalid_hypothesis: It is certain that lily is white, and Bill went to the kitchen.
hypothesis_assertion: Lily is white, and Bill went to the kitchen.