What do circles on a crossword mean?

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Tags

1. #cheat
2. #other
3. #theme
4. #related
5. #letters
6. #puzzle
7. #consecutively
8. #circle
9. #spell
10. #crossword
11. #square
12. #white
13. #squares
14. #words
15. #sometimes
16. #appear
17. #circles
18. #either
19. #contain
20. #rearranged
21. #which