context: It is almost certain that Brian is a swan. We believe that Bill is in the park. It is unlikely that John went to the hallway.
hypothesis: There is a very good chance that bill is in the park, and John went to the hallway.
valid_hypothesis: There is little chance that bill is in the park, and John went to the hallway.
invalid_hypothesis: There is a very good chance that bill is in the park, and John went to the hallway.
hypothesis_assertion: Bill is in the park, and John went to the hallway.