陰陽家yīnyángjiāSchool of Yin-Yang of the Warring States Period (475-221 BC) founded by Zou Yan 邹衍 zōuyǎn
陰陽合同yīnyánghétóngdeal where the parties collude to sign an under-the-table "yin contract" 阴合同 as well as an ostensibly genuine "yang contract" 阳合同 in order to deceive authorities
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