context: We believe that Lily is white. It is certain that Mary dropped the milk. It is probably not the case that Bernhard is a swan. Chances are about even that if Lily is white, or Mary dropped the milk, then John discarded the milk. It is probably not the case that if either Bernhard is a swan, or Mary dropped the milk, then Julius is gray. Chances are slight that if Mary dropped the milk, and Bernhard is a swan, then Winona is a mouse.
hypothesis: It is highly unlikely that either Winona is a mouse, or Lily is white.
valid_hypothesis: We believe that either Winona is a mouse, or Lily is white.
invalid_hypothesis: It is highly unlikely that either Winona is a mouse, or Lily is white.
hypothesis_assertion: Either Winona is a mouse, or Lily is white.