context: We doubt that Lily is yellow. There is a better than even chance that Bill is in the school. It is unlikely that Emily is a sheep. We doubt that if either Lily is yellow, or Bill is in the school, then Daniel left the milk. There is a better than even chance that if Lily is yellow, or Emily is a sheep, then John went to the garden. It is improbable that if Emily is a sheep, and Lily is yellow, then Greg is gray.
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: It is certain that greg is gray, and Lily is yellow.
hypothesis_assertion: Greg is gray, and Lily is yellow.