How many 688 class submarines are there?

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Tags

1. #submarine
2. #submarines
3. #generations
4. #fleet
5. #angeles
6. #after
7. #number
8. #commission
9. #century
10. #still
11. #known
12. #attack
13. #represent
14. #service
15. #class
16. #vessel
17. #close
18. #retired