context: Chances are slight that Brian is a rhino. There is little chance that Mary dropped the apple. Chances are slight that Gertrude is a cat. There is a better than even chance that if Gertrude is a cat, and Brian is a rhino, then Daniel grabbed the milk. It is almost certain that if Mary dropped the apple, or Gertrude is a cat, then Julius is a frog. It is probable that if Mary dropped the apple, or Gertrude is a cat, then Bernhard is a swan.
hypothesis: There is almost no chance that bernhard is a swan, and Brian is a rhino.
valid_hypothesis: There is almost no chance that bernhard is a swan, and Brian is a rhino.
invalid_hypothesis: It is likely that bernhard is a swan, and Brian is a rhino.
hypothesis_assertion: Bernhard is a swan, and Brian is a rhino.