Spaceship freezer, defrost process:
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Cool sound for notification
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Android notification sound
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Humming fan, off, Computer turning on
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A vacuum cleaner
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Exhaust fan
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An electric toothbrush
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Popcorn machine
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Defrost process, Spaceship freezer
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Faulty air conditioning, vibration noise
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IPhone notification sound
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Electric wheelchair
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Windows notification sound
★★★★★