Fan blade rotation, air cut:
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Vibration noise, Faulty air conditioning
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Air cut, Fan blade rotation
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An electric toothbrush
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Sewing machine
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Windows notification sound
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Defrost process, Spaceship freezer
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Electronic melody for SMS alerts
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Computer turning on, off, humming fan
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Exhaust fan
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Clothes dryer
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Off, Air conditioning, on
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Popcorn machine
★★★★★