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How to arrange the invitation codes of smart Kunshan classmates?

1, first of all, is the combination of letters and numbers. The invitation code of smart Kunshan students usually consists of letters and numbers.

2. Secondly, the length is fixed. The invitation code has a fixed length requirement, and the length of the invitation code is 6 or 8 digits.

3. Finally, it is randomly generated. Invitation codes are usually generated randomly to ensure uniqueness and security. Each invitation code is unique.