Where is a transponder required?

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  1. #above
  2. #states
  3. #district
  4. #airspace
  5. #primary
  6. #excluding
  7. #airport
  8. #columbia
  9. #below
  10. #contiguous
  11. #within
  12. #miles
  13. #class
  14. #transponder
  15. #requirements