Zhou Tiangong includes Xiao Tiangong (also known as "Meridian Sunday", "Hundred-day Foundation" and "Taking Ridge to Fill the Gap") and Zhou Tiangong (also known as "You Mao Sunday" and "Gankun copulation"). It is generally believed that Bao Puzi, who originated from Ge Hong in Jin Dynasty, has been continuously supplemented and improved by later generations.
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