context: Chances are about even that Bernhard is a swan. There is little chance that Brian is white. We believe that Julius is a rhino. It is probable that if Brian is white, and Bernhard is a swan, then Emily is a mouse. It is certain that if Bernhard is a swan, or Julius is a rhino, then Greg is gray. It is probably not the case that if Brian is white, or Bernhard is a swan, then Lily is green.
hypothesis: We doubt that either Lily is green, or Brian is white.
valid_hypothesis: We doubt that either Lily is green, or Brian is white.
invalid_hypothesis: It is highly likely that either Lily is green, or Brian is white.
hypothesis_assertion: Either Lily is green, or Brian is white.