Fan blade rotation, air cut:
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Electronic melody for SMS alerts
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Exhaust fan
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IPhone notification sound
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An electric toothbrush
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Sound to start presentation
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Electric wheelchair
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Air cut, Fan blade rotation
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Vibration noise, Faulty air conditioning
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Defrost process, Spaceship freezer
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Hissing old tv
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Popcorn machine
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On, off, Air conditioning
★★★★★