What's harder than diamond?

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Tags

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2. #indenters
3. #physorg
4. #world
5. #compressive
6. #large
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8. #under
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11. #diamond
12. #regarded
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14. #strength
15. #boron
16. #considering
17. #currently
18. #known
19. #pressures
20. #indentation
21. #material
22. #scientists
23. #nitride