What does GCHQ stand for?

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Tags

1. #messages
2. #conversations
3. #gather
4. #phone
5. #mails
6. #people
7. #secrets
8. #between
9. #signals
10. #monitor
11. #communications
12. #headquarters
13. #reading
14. #decode
15. #government
16. #secret
17. #stands
18. #information
19. #secretly
20. #agents
21. #listening
22. #satellite
23. #communication