Does everything have a serial number?

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Tags

1. #codes
2. #assigned
3. #referred
4. #hardware
5. #banknotes
6. #unique
7. #group
8. #number
9. #other
10. #including
11. #software
12. #individual
13. #identifying
14. #letters
15. #often
16. #though
17. #things
18. #similar
19. #piece
20. #numbers
21. #documents
22. #sometimes
23. #serial