context: It is probable that Fred moved to the office. Chances are about even that Mary grabbed the apple. It is unlikely that Brian is a swan.
hypothesis: We believe that brian is a swan, or Fred moved to the office.
valid_hypothesis: We believe that brian is a swan, or Fred moved to the office.
invalid_hypothesis: We doubt that brian is a swan, or Fred moved to the office.
hypothesis_assertion: Brian is a swan, or Fred moved to the office.