context: It is unlikely that Greg is a swan. It is certain that John moved to the office. We doubt that Lily is gray. It is unlikely that if John moved to the office, and Lily is gray, then Mary is in the office. It is certain that if John moved to the office, and Greg is a swan, then Brian is green. There is a better than even chance that if Greg is a swan, or John moved to the office, then Julius is gray.
hypothesis: There is a very good chance that either Greg is a swan, or John moved to the office.
valid_hypothesis: There is a very good chance that either Greg is a swan, or John moved to the office.
invalid_hypothesis: Chances are slight that either Greg is a swan, or John moved to the office.
hypothesis_assertion: Either Greg is a swan, or John moved to the office.