What are the edges in the overlay network?

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1. #using
2. #physical
3. #components
4. #logical
5. #overlay
6. #these
7. #underlying
8. #having
9. #virtual
10. #through
11. #links
12. #another
13. #built
14. #networks
15. #network
16. #connected
17. #connect
18. #which
19. #nodes
20. #computer