kidney-yin deficiency and kidney-yang deficiency

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What is the difference between kidney-yin deficiency and kidney-yang deficiency? Kidney Yin deficiency eat Liuwei Dihuang pills, then what medicine should be used for Kidney Yang deficiency?
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What is the difference between kidney-yin deficiency and kidney-yang deficiency? Kidney Yin deficiency eat Liuwei Dihuang pills, then what medicine should be used for Kidney Yang deficiency?