How many Seawolf class submarines are there?

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Tags

1. #reduced
2. #class
3. #seawolf
4. #began
5. #attack
6. #service
7. #intended
8. #design
9. #submarines
10. #powered
11. #states
12. #period
13. #built
14. #fleet
15. #nuclear
16. #successor
17. #angeles
18. #united