context: Chances are about even that John left the milk. It is impossible that Brian is gray. We believe that Mary went to the hallway. There is a very good chance that if Mary went to the hallway, or John left the milk, then Lily is a rhino. It is probably not the case that if either Mary went to the hallway, or John left the milk, then Julius is white. Chances are about even that if John left the milk, and Brian is gray, then Winona is a sheep.
hypothesis: It is certain that either Winona is a sheep, or John left the milk.
valid_hypothesis: Chances are about even that either Winona is a sheep, or John left the milk.
invalid_hypothesis: It is certain that either Winona is a sheep, or John left the milk.
hypothesis_assertion: Either Winona is a sheep, or John left the milk.