context: It is unlikely that Brian is a swan. There is a very good chance that Sandra left the football. We believe that Lily is a frog. It is improbable that if Lily is a frog, or Brian is a swan, then Mary went to the kitchen. Chances are about even that if Sandra left the football, or Lily is a frog, then Bernhard is gray. It is impossible that if Sandra left the football, and Lily is a frog, then John moved to the office.
hypothesis: There is a very good chance that sandra left the football, and John moved to the office.
valid_hypothesis: It is impossible that sandra left the football, and John moved to the office.
invalid_hypothesis: There is a very good chance that sandra left the football, and John moved to the office.
hypothesis_assertion: Sandra left the football, and John moved to the office.