Is Sylvester Stallone a real boxer?

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Tags

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2. #stallone
3. #director
4. #producer
5. #boxer
6. #rocky
7. #writer
8. #portraying
9. #actor
10. #characters
11. #vietnam
12. #balboa
13. #sylvester
14. #stars
15. #known
16. #rambo
17. #veteran
18. #popular
19. #heroic
20. #action