What is a Steam summer sale?

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Tags

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2. #tradition
3. #video
4. #published
5. #digital
6. #dates
7. #distribution
8. #success
9. #weeks
10. #platform
11. #leaked
12. #related
13. #database
14. #summer
15. #leaks
16. #steam
17. #begin
18. #correctly
19. #games