2. After paying attention to the official account of WeChat, reply the keyword "detect" in the message bar, and you can get a free coupon of 10000 words.
3. After getting the free coupon, enter the checkvvip paper duplicate checking system and select the checkpass detection system. Then, when paying, select "Customized Order" to enter the free coupon, and click Check Copy Now to test for free.
4. If the order quantity is insufficient (one coupon can only measure 1000 words), you can use other WeChat to get a free coupon and use it together.