context: Chances are about even that Sandra put down the milk. Chances are about even that Lily is a rhino. It is certain that Winona is a mouse. It is highly unlikely that if Winona is a mouse, or Lily is a rhino, then Brian is a swan. We believe that if Winona is a mouse, and Sandra put down the milk, then Julie is in the office. It is highly unlikely that if Lily is a rhino, and Winona is a mouse, then Bernhard is green.
hypothesis: It is impossible that bernhard is green, and Brian is a swan.
valid_hypothesis: It is impossible that bernhard is green, and Brian is a swan.
invalid_hypothesis: It is probably the case that bernhard is green, and Brian is a swan.
hypothesis_assertion: Bernhard is green, and Brian is a swan.