context: There is a very good chance that Gertrude is a mouse. It is impossible that Yann got the milk there. There is almost no chance that Sandra took the apple. There is a better than even chance that if Sandra took the apple, and Yann got the milk there, then Bernhard is a lion. It is impossible that if Gertrude is a mouse, or Yann got the milk there, then Greg is gray. Chances are slight that if either Sandra took the apple, or Yann got the milk there, then Brian is a rhino.
hypothesis: It is impossible that either Bernhard is a lion, or Greg is gray.
valid_hypothesis: It is impossible that either Bernhard is a lion, or Greg is gray.
invalid_hypothesis: It is highly likely that either Bernhard is a lion, or Greg is gray.
hypothesis_assertion: Either Bernhard is a lion, or Greg is gray.