context: It is probably not the case that Yann is tired. There is a very good chance that Bernhard is a swan. It is improbable that Greg is yellow. It is improbable that if Greg is yellow, and Bernhard is a swan, then John discarded the apple. Chances are about even that if Yann is tired, or Greg is yellow, then Julius is gray. It is highly unlikely that if Greg is yellow, or Bernhard is a swan, then Sandra grabbed the milk.
hypothesis: It is probably not the case that either Sandra grabbed the milk, or Yann is tired.
valid_hypothesis: It is probably not the case that either Sandra grabbed the milk, or Yann is tired.
invalid_hypothesis: It is probable that either Sandra grabbed the milk, or Yann is tired.
hypothesis_assertion: Either Sandra grabbed the milk, or Yann is tired.