context: It is improbable that Winona is a cat. We believe that Bernhard is a swan. It is almost certain that Mary dropped the milk. It is improbable that if either Mary dropped the milk, or Bernhard is a swan, then Emily is a mouse. There is almost no chance that if Winona is a cat, and Bernhard is a swan, then Sandra got the apple. It is probable that if Winona is a cat, and Mary dropped the milk, then John went to the bedroom.
hypothesis: It is impossible that bernhard is a swan, and Sandra got the apple.
valid_hypothesis: It is impossible that bernhard is a swan, and Sandra got the apple.
invalid_hypothesis: Chances are about even that bernhard is a swan, and Sandra got the apple.
hypothesis_assertion: Bernhard is a swan, and Sandra got the apple.