context: It is impossible that Fred went to the garden. It is likely that Mary grabbed the milk. We doubt that Brian is a swan.
hypothesis: We believe that brian is a swan, or Mary grabbed the milk.
valid_hypothesis: We believe that brian is a swan, or Mary grabbed the milk.
invalid_hypothesis: There is little chance that brian is a swan, or Mary grabbed the milk.
hypothesis_assertion: Brian is a swan, or Mary grabbed the milk.