context: It is unlikely that Lily is yellow. There is almost no chance that Greg is gray. Chances are slight that Mary left the football.
hypothesis: It is impossible that greg is gray, and Lily is yellow.
valid_hypothesis: It is impossible that greg is gray, and Lily is yellow.
invalid_hypothesis: There is a very good chance that greg is gray, and Lily is yellow.
hypothesis_assertion: Greg is gray, and Lily is yellow.