context: It is unlikely that Sandra left the football. There is almost no chance that John went to the garden. There is little chance that Greg is a swan.
hypothesis: We believe that either Sandra left the football, or Greg is a swan.
valid_hypothesis: It is probably not the case that either Sandra left the football, or Greg is a swan.
invalid_hypothesis: We believe that either Sandra left the football, or Greg is a swan.
hypothesis_assertion: Either Sandra left the football, or Greg is a swan.