How many copies has FTL sold?

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5. Are Tachyons real?
6. Can you survive a black hole?
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Tags

1. #months
2. #although
3. #their
4. #reviews
5. #later
6. #least
7. #davies
8. #copies
9. #sales
10. #estimated
11. #released
12. #tightlipped
13. #positive
14. #figures
15. #million