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  1. sixty cycle hum
  2. sixty cycle hum
  3. sixty cycle hum
  4. sixty cycle hum
  5. sixty cycle hum
  6. sixty cycle hum
  7. sixty cycle hum
  8. sixty cycle hum
  9. sixty cycle hum
  10. sixty cycle hum
  11. sixty cycle hum
  12. sixty cycle hum
  13. sixty cycle hum
  14. sixty cycle hum
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  16. sixty cycle hum
  17. sixty cycle hum
  18. sixty cycle hum
  19. sixty cycle hum
  20. sixty cycle hum