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I thought you might be interested in looking at Phép "cân Xương Tính Số".
http://diendan.lyhocdongphuong.org.vn/chu-de/26701-ph%C3%A9p-c%C3%A2n-x%C6%B0%C6%A1ng-t%C3%ADnh-s%E1%BB%91/?do=findComment&comment=182787
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