context: Chances are about even that Yann is thirsty. It is improbable that Mary dropped the apple. It is likely that Brian is a lion. It is probable that if Mary dropped the apple, or Brian is a lion, then Gertrude is a mouse. It is unlikely that if Mary dropped the apple, or Brian is a lion, then Jessica is a sheep. It is improbable that if Brian is a lion, and Yann is thirsty, then John went to the garden.
hypothesis: It is probable that john went to the garden, and Gertrude is a mouse.
valid_hypothesis: There is almost no chance that john went to the garden, and Gertrude is a mouse.
invalid_hypothesis: It is probable that john went to the garden, and Gertrude is a mouse.
hypothesis_assertion: John went to the garden, and Gertrude is a mouse.