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因爲我不是付費用戶 有需求的就拿去用吧 明天就過期了
To redeem your voucher, click here and follow the instructions under "Applying the coupon." You will need to use the coupon code edX-c6stu45-fall2012. The coupon expires on October 21, so be sure to apply it right away.
因爲我不是付費用戶 有需求的就拿去用吧 明天就過期了
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