Scattered in ancient books of pre-Qin and Han dynasties, later generations concentrated on the source of ancient poems in Qing dynasty, and today Kai's Poems of Qin, Han, Wei, Jin, Southern and Northern Dynasties are the most detailed. However, this is not entirely credible. Among them, Song of Breaking the Earth, Song of Qingyun and Song of Nanfeng are all under the disguise of later generations.
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