Why is my Mac not letting me copy and paste?

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Tags

1. #conflicting
2. #trick
3. #shortcuts
4. #after
5. #other
6. #mouse
7. #restart
8. #reason
9. #going
10. #enabled
11. #whatever
12. #paste
13. #working
14. #choosing
15. #still
16. #sometimes
17. #apple
18. #standard
19. #ahead
20. #keyboard