context: There is a very good chance that Greg is a swan. It is certain that Lily is white. Chances are slight that Bill is in the school.
hypothesis: It is highly unlikely that either Greg is a swan, or Bill is in the school.
valid_hypothesis: We believe that either Greg is a swan, or Bill is in the school.
invalid_hypothesis: It is highly unlikely that either Greg is a swan, or Bill is in the school.
hypothesis_assertion: Either Greg is a swan, or Bill is in the school.