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* 所不能形容輒以連綿字狀之如詩之詠文王曰穆穆亹亹～～ 肅肅如見文王之德容心志此篇

(translated) used to indicate reduplicative words to describe something indescribable, like "穆穆亹亹 (mù mù ǎi ǎi)"