A site was newly discovered in a certain place. After analysis, the experts made the following assumptions: If the site is from the Western Han or Eastern Han Dynasty, it is not from the Southern and Northern Jin Dynasties. After further identification by the experts, the site is not the Western Han Dynasty. This shows:. ['It is not from the Eastern Han Dynasty.', 'It was from the Eastern Han Dynasty.', 'It was from the Southern Jin Dynasty.', 'It may be from the Northern Jin Dynasty.']