Did the great wall work?

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6. Who invented walls?
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Tags

1. #shanhai
2. #failed
3. #manchu
4. #history
5. #building
6. #several
7. #points
8. #through
9. #china
10. #ardent
11. #including
12. #replaced
13. #throughout
14. #rulers
15. #great
16. #raids
17. #enemies
18. #gates
19. #marched
20. #dynasties
21. #although
22. #against
23. #deterrent
24. #useful