context: There is a better than even chance that Daniel left the football. There is little chance that Greg is a frog. It is impossible that Brian is gray. It is impossible that if Daniel left the football, and Greg is a frog, then Julius is a lion. It is unlikely that if either Daniel left the football, or Brian is gray, then Bernhard is gray. Chances are slight that if Greg is a frog, and Brian is gray, then Mary got the milk.
hypothesis: It is likely that brian is gray, and Bernhard is gray.
valid_hypothesis: It is impossible that brian is gray, and Bernhard is gray.
invalid_hypothesis: It is likely that brian is gray, and Bernhard is gray.
hypothesis_assertion: Brian is gray, and Bernhard is gray.