What are the 4 digits after ZIP code?

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Tags

1. #destination
2. #delivery
3. #digits
4. #within
5. #assist
6. #specific
7. #parts
8. #represents
9. #first
10. #route
11. #overall
12. #office
13. #digit
14. #effectively
15. #consists
16. #indicate
17. #complete
18. #sorting