context: It is probable that Lily is white. It is certain that John left the football. It is likely that Julius is a frog. There is a very good chance that if Lily is white, and John left the football, then Yann is thirsty. It is highly unlikely that if John left the football, or Julius is a frog, then Greg is yellow. It is improbable that if Lily is white, or Julius is a frog, then Brian is green.
hypothesis: It is highly unlikely that brian is green, and Yann is thirsty.
valid_hypothesis: It is highly unlikely that brian is green, and Yann is thirsty.
invalid_hypothesis: We believe that brian is green, and Yann is thirsty.
hypothesis_assertion: Brian is green, and Yann is thirsty.