Why does my Excel have numbers instead of letters?

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Tags

1. #numbers
2. #style
3. #default
4. #changed
5. #reference
6. #excel
7. #selection
8. #columns
9. #refers
10. #check
11. #solution
12. #letters
13. #which
14. #headings
15. #preferences
16. #instead
17. #column
18. #clear
19. #cause