context: Chances are about even that Brian is a swan. There is little chance that John got the apple. We doubt that Greg is white.
hypothesis: Chances are slight that greg is white, and Brian is a swan.
valid_hypothesis: Chances are slight that greg is white, and Brian is a swan.
invalid_hypothesis: We believe that greg is white, and Brian is a swan.
hypothesis_assertion: Greg is white, and Brian is a swan.