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What is the format of synchronizing classroom editing SMS to obtain verification code?

The verification code is usually a number. If parents want to open it, they can open it themselves. By texting "3694" to 10086, they can get a 6-digit verification code, fill it in the application form of synchronous classroom experience and give it to the school teacher. After that, the customer service staff who synchronize the classroom can also open an account for the teacher and experience it for free.