Spaceship freezer, defrost process:
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Sound to start presentation
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Whatsapp notification sound
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Air conditioning (outdoor unit)
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Vibration noise, Faulty air conditioning
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IPhone notification sound
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Electronic melody for SMS alerts
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Fan blade rotation, air cut
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Sewing machine
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Hissing old tv
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Electric wheelchair
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Clothes dryer
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Computer turning on, off, humming fan
★★★★★