Sound to start presentation:
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Spaceship freezer, defrost process
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Hissing old tv
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An electric toothbrush
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Electric wheelchair
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Clothes dryer
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Whatsapp notification sound
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Off, Computer turning on, humming fan
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Windows notification sound
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Electronic melody for SMS alerts
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Android notification sound
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A vacuum cleaner
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Faulty air conditioning, vibration noise
★★★★★