How do spark plugs look when bad?

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2. #around
3. #heavy
4. #which
5. #makes
6. #deposits
7. #strong
8. #black
9. #mixture
10. #typically
11. #occur
12. #harder
13. #object
14. #spark
15. #found
16. #fully
17. #little
18. #plugs
19. #ignite
20. #center
21. #cylinder