context: It is probable that Brian is a rhino. It is highly unlikely that Mary dropped the milk. There is almost no chance that Sandra left the milk. There is a very good chance that if Mary dropped the milk, or Brian is a rhino, then Emily is a cat. It is highly unlikely that if Sandra left the milk, and Mary dropped the milk, then Greg is green. There is almost no chance that if Brian is a rhino, or Sandra left the milk, then John picked up the apple.
hypothesis: We believe that sandra left the milk, or John picked up the apple.
valid_hypothesis: There is almost no chance that sandra left the milk, or John picked up the apple.
invalid_hypothesis: We believe that sandra left the milk, or John picked up the apple.
hypothesis_assertion: Sandra left the milk, or John picked up the apple.