Introduction - If you have any usage issues, please Google them yourself
The mysteries of identity: Enter group ID number n, the number of the first act, after the ID number of each act. If you enter the ID number is 15, then after the upgrade to 18-bit display output to determine whether it is legitimate or ID number, and progressive output. Enter the desired output test test 1 1. 4 ? 2. 350622197904130331 ? 3. 11010519491231002X ? 4. 110105491231002 ? 5. 110105491231996 ? 1. Invalid ? 2. Valid ? 3. 11010519491231002X ? 4. 110105184912319965 ?