Can crossword puzzles have spaces?

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Tags

1. #puzzles
2. #however
3. #answers
4. #special
5. #spaces
6. #shading
7. #states
8. #treatment
9. #empty
10. #boxes
11. #include
12. #crossword
13. #printed
14. #regular
15. #typical
16. #united
17. #puzzle
18. #multiple
19. #present
20. #separators
21. #without
22. #other
23. #appear