context: It is almost certain that John put down the milk. Chances are about even that Brian is green. We doubt that Gertrude is a sheep.
hypothesis: We doubt that john put down the milk, and Gertrude is a sheep.
valid_hypothesis: We doubt that john put down the milk, and Gertrude is a sheep.
invalid_hypothesis: It is certain that john put down the milk, and Gertrude is a sheep.
hypothesis_assertion: John put down the milk, and Gertrude is a sheep.