Who Created yin and yang?

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Tags

1. #opposites
2. #chinese
3. #fundamental
4. #young
5. #principle
6. #example
7. #century
8. #things
9. #contradictory
10. #female
11. #culture
12. #philosophy
13. #earlier
14. #light
15. #general
16. #dating
17. #exist
18. #concept
19. #inseparable