I Ching 易經蓍草占卜

from Robert Yang, originally released 4th August, 2009

易傳曰:“大衍之數五十,其用四十有九。分而為二以象兩,挂一以象三,揲之以 四以象四時,歸奇于扐以象閏,五歲再閏,故再扐而後挂.”
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