How are postcodes allocated?

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Tags

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2. #formatted
3. #between
4. #format
5. #address
6. #first
7. #delivery
8. #postcode
9. #tells
10. #office
11. #alphanumeric
12. #postcodes
13. #properly
14. #written
15. #round
16. #right
17. #outward
18. #which
19. #inward
20. #characters