context: There is little chance that Sandra took the football. We doubt that Greg is a lion. It is highly unlikely that Daniel dropped the apple. It is highly unlikely that if Daniel dropped the apple, and Greg is a lion, then Brian is white. It is unlikely that if Greg is a lion, or Sandra took the football, then Yann is thirsty. It is likely that if either Sandra took the football, or Greg is a lion, then Lily is a frog.
hypothesis: There is a better than even chance that brian is white, and Sandra took the football.
valid_hypothesis: It is impossible that brian is white, and Sandra took the football.
invalid_hypothesis: There is a better than even chance that brian is white, and Sandra took the football.
hypothesis_assertion: Brian is white, and Sandra took the football.