How is PNR number generated?

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6. How long is PNR number?
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Tags

1. #stands
2. #passenger
3. #booked
4. #number
5. #corner
6. #ticket
7. #railway
8. #after
9. #generated
10. #tickets
11. #record
12. #upper
13. #stations
14. #digit
15. #found
16. #automatically
17. #classic
18. #system