context: It is highly unlikely that Greg is a rhino. Chances are slight that Brian is gray. Chances are about even that Sandra grabbed the milk. It is probably not the case that if either Greg is a rhino, or Brian is gray, then Julius is white. It is certain that if Greg is a rhino, or Sandra grabbed the milk, then John left the apple. It is certain that if Sandra grabbed the milk, or Greg is a rhino, then Winona is a cat.
hypothesis: It is certain that sandra grabbed the milk, or Winona is a cat.
valid_hypothesis: Chances are about even that sandra grabbed the milk, or Winona is a cat.
invalid_hypothesis: It is certain that sandra grabbed the milk, or Winona is a cat.
hypothesis_assertion: Sandra grabbed the milk, or Winona is a cat.