context: We doubt that Brian is gray. We believe that Sandra took the apple. It is certain that Yann is thirsty. It is certain that if either Yann is thirsty, or Sandra took the apple, then Mary put down the milk. There is a very good chance that if Brian is gray, and Yann is thirsty, then John left the milk. It is highly unlikely that if Sandra took the apple, or Yann is thirsty, then Greg is a rhino.
hypothesis: It is certain that mary put down the milk, or Yann is thirsty.
valid_hypothesis: It is certain that mary put down the milk, or Yann is thirsty.
invalid_hypothesis: We doubt that mary put down the milk, or Yann is thirsty.
hypothesis_assertion: Mary put down the milk, or Yann is thirsty.