What are the components of use case diagrams?

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Tags

1. #specific
2. #interest
3. #individuals
4. #system
5. #components
6. #which
7. #their
8. #played
9. #world
10. #within
11. #around
12. #involved
13. #defined
14. #boundary
15. #roles
16. #cases
17. #defines
18. #actors
19. #according
20. #usually
21. #relation
22. #contains
23. #diagram