How long did it take for the twin towers to collapse?

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Tags

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  2. #after
  3. #during
  4. #collapse
  5. #world
  6. #tower
  7. #flight
  8. #whole
  9. #impact
  10. #burns
  11. #attacks
  12. #center
  13. #minutes
  14. #trade
  15. #north
  16. #collapses
  17. #building
  18. #burned