context: There is little chance that Greg is a swan. We doubt that Brian is gray. It is impossible that John got the football.
hypothesis: We believe that either Greg is a swan, or John got the football.
valid_hypothesis: Chances are slight that either Greg is a swan, or John got the football.
invalid_hypothesis: We believe that either Greg is a swan, or John got the football.
hypothesis_assertion: Either Greg is a swan, or John got the football.