context: It is improbable that Gertrude is a mouse. It is highly unlikely that Brian is gray. There is almost no chance that Sandra grabbed the milk. Chances are about even that if either Brian is gray, or Gertrude is a mouse, then Bernhard is green. It is impossible that if Brian is gray, and Gertrude is a mouse, then Greg is white. It is highly unlikely that if Sandra grabbed the milk, and Gertrude is a mouse, then Lily is a swan.
hypothesis: It is likely that gertrude is a mouse, or Greg is white.
valid_hypothesis: Chances are slight that gertrude is a mouse, or Greg is white.
invalid_hypothesis: It is likely that gertrude is a mouse, or Greg is white.
hypothesis_assertion: Gertrude is a mouse, or Greg is white.