context: It is impossible that Greg is a swan. There is a very good chance that Sandra left the apple. We believe that Brian is a rhino.
hypothesis: There is little chance that either Brian is a rhino, or Greg is a swan.
valid_hypothesis: We believe that either Brian is a rhino, or Greg is a swan.
invalid_hypothesis: There is little chance that either Brian is a rhino, or Greg is a swan.
hypothesis_assertion: Either Brian is a rhino, or Greg is a swan.