context: It is highly unlikely that Mary discarded the apple. It is impossible that Jessica is a mouse. It is highly unlikely that John moved to the garden. We doubt that if Jessica is a mouse, and John moved to the garden, then Brian is gray. It is unlikely that if either John moved to the garden, or Jessica is a mouse, then Greg is a rhino. Chances are about even that if Mary discarded the apple, or John moved to the garden, then Yann got the milk there.
hypothesis: We believe that yann got the milk there, or Jessica is a mouse.
valid_hypothesis: It is highly unlikely that yann got the milk there, or Jessica is a mouse.
invalid_hypothesis: We believe that yann got the milk there, or Jessica is a mouse.
hypothesis_assertion: Yann got the milk there, or Jessica is a mouse.