context: Chances are about even that Jessica is a mouse. There is almost no chance that Brian is a swan. We doubt that Sandra left the football. There is a better than even chance that if Jessica is a mouse, or Brian is a swan, then Julius is a rhino. We believe that if Sandra left the football, and Brian is a swan, then Lily is yellow. It is likely that if either Sandra left the football, or Jessica is a mouse, then Yann got the milk there.
hypothesis: It is probably not the case that yann got the milk there, or Brian is a swan.
valid_hypothesis: It is probably not the case that yann got the milk there, or Brian is a swan.
invalid_hypothesis: There is a very good chance that yann got the milk there, or Brian is a swan.
hypothesis_assertion: Yann got the milk there, or Brian is a swan.