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[2. 线上如何使用优惠券](2.%E6%94%B6%E9%93%B6%E5%A6%82%E4%BD%95%E4%BD%BF%E7%94%A8%E4%BC%98%E6%83%A0%E5%88%B8.md)
[3. 线下如何使用优惠券](3.%E7%BA%BF%E4%B8%8B%E5%A6%82%E4%BD%95%E4%BD%BF%E7%94%A8%E4%BC%98%E6%83%A0%E5%88%B8.md)