What is UI system in mobile?

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1. #error
2. #unsuccessfully
3. #android
4. #search
5. #interface
6. #working
7. #update
8. #message
9. #because
10. #reason
11. #either
12. #system
13. #corrupted
14. #device
15. #occurs
16. #application
17. #compatible
18. #patched
19. #common
20. #google
21. #running
22. #stopped
23. #shown
24. #updated