context: There is a very good chance that Sandra put down the milk. We doubt that John left the milk. It is probably the case that Mary took the apple. Chances are slight that if Sandra put down the milk, or John left the milk, then Lily is white. There is almost no chance that if John left the milk, and Sandra put down the milk, then Greg is a rhino. There is a better than even chance that if Mary took the apple, or Sandra put down the milk, then Brian is a swan.
hypothesis: It is highly unlikely that either Greg is a rhino, or Mary took the apple.
valid_hypothesis: It is probable that either Greg is a rhino, or Mary took the apple.
invalid_hypothesis: It is highly unlikely that either Greg is a rhino, or Mary took the apple.
hypothesis_assertion: Either Greg is a rhino, or Mary took the apple.