context: It is highly unlikely that Greg is a swan. There is a very good chance that Brian is a rhino. We doubt that Sandra grabbed the milk.
hypothesis: It is highly unlikely that greg is a swan, and Brian is a rhino.
valid_hypothesis: It is highly unlikely that greg is a swan, and Brian is a rhino.
invalid_hypothesis: It is certain that greg is a swan, and Brian is a rhino.
hypothesis_assertion: Greg is a swan, and Brian is a rhino.