Popcorn machine:
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Computer turning on, off, humming fan
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Faulty air conditioning, vibration noise
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Cool sound for notification
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Android notification sound
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Portable fan
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Electronic melody for SMS alerts
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IPhone notification sound
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An electric toothbrush
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Defrost process, Spaceship freezer
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Whatsapp notification sound
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Email message sound
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Clothes dryer
★★★★★