context: It is certain that Brian is yellow. We doubt that Julius is a swan. There is almost no chance that Greg is gray.
hypothesis: There is almost no chance that greg is gray, and Brian is yellow.
valid_hypothesis: There is almost no chance that greg is gray, and Brian is yellow.
invalid_hypothesis: It is almost certain that greg is gray, and Brian is yellow.
hypothesis_assertion: Greg is gray, and Brian is yellow.