context: It is almost certain that Sandra got the football. Chances are about even that Greg is yellow. It is unlikely that Brian is a swan. It is probably the case that if Brian is a swan, or Sandra got the football, then Lily is green. It is probable that if Brian is a swan, and Greg is yellow, then John moved to the garden. It is almost certain that if either Brian is a swan, or Greg is yellow, then Mary went to the office.
hypothesis: It is impossible that either Sandra got the football, or Brian is a swan.
valid_hypothesis: We believe that either Sandra got the football, or Brian is a swan.
invalid_hypothesis: It is impossible that either Sandra got the football, or Brian is a swan.
hypothesis_assertion: Either Sandra got the football, or Brian is a swan.