context: It is highly unlikely that Mary took the apple. We believe that Yann got the milk there. It is improbable that Brian is a swan. It is likely that if Brian is a swan, and Yann got the milk there, then John went to the bedroom. There is little chance that if Mary took the apple, and Brian is a swan, then Greg is white. We believe that if Mary took the apple, and Brian is a swan, then Bernhard is gray.
hypothesis: It is impossible that bernhard is gray, and Brian is a swan.
valid_hypothesis: It is impossible that bernhard is gray, and Brian is a swan.
invalid_hypothesis: It is likely that bernhard is gray, and Brian is a swan.
hypothesis_assertion: Bernhard is gray, and Brian is a swan.