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上下唇二十年
若口不方者不贵，是一齐之齿，四海之方圆，合要方，开要圆。齿齐密者，取富贵准也。若齿有三十六个者，大贵。如稀少者及唇掀者，贱，如四海方圆，高得助也。唇红齿白，富贵之苗也。
月波洞中记 · 郑樵 · Chapter 19 of 42
上下唇二十年
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