context: Chances are about even that Mary grabbed the milk. It is improbable that John dropped the milk. It is unlikely that Lily is a rhino.
hypothesis: Chances are about even that either John dropped the milk, or Mary grabbed the milk.
valid_hypothesis: Chances are about even that either John dropped the milk, or Mary grabbed the milk.
invalid_hypothesis: There is almost no chance that either John dropped the milk, or Mary grabbed the milk.
hypothesis_assertion: Either John dropped the milk, or Mary grabbed the milk.