What teams have never been relegated?

Related questions

1. When did Chelsea win Europa League?
2. Who are Arsenal's rivals?
3. Which team did Chelsea beat to win the Champions League?
4. What trophies have Chelsea won?
5. When did Chelsea win the Europa League?
6. When did Chelsea win the league?
7. Who is Chelsea's coach?
8. When last did Chelsea win the Champions League?
9. Did Rangers die?
10. How did Chelsea win Champions League?

Tags

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2. #country
3. #league
4. #villa
5. #chelsea
6. #manchester
7. #united
8. #since
9. #there
10. #arsenal
11. #english
12. #currently
13. #liverpool
14. #tottenham
15. #aston
16. #existence
17. #seven
18. #never
19. #however
20. #premier
21. #relegated
22. #hotspur
23. #division
24. #clubs
25. #start
26. #everton