context: There is little chance that Lily is a rhino. Chances are about even that Mary got the milk. It is improbable that Brian is a swan. There is a very good chance that if Brian is a swan, or Mary got the milk, then Jessica is a mouse. It is certain that if either Brian is a swan, or Mary got the milk, then Sandra took the football. There is almost no chance that if Lily is a rhino, or Mary got the milk, then John went to the garden.
hypothesis: It is highly unlikely that either Lily is a rhino, or Jessica is a mouse.
valid_hypothesis: Chances are about even that either Lily is a rhino, or Jessica is a mouse.
invalid_hypothesis: It is highly unlikely that either Lily is a rhino, or Jessica is a mouse.
hypothesis_assertion: Either Lily is a rhino, or Jessica is a mouse.