Opening, closing the laptop cover:
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Typewriter, Office work, environmental sounds
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Computer keyboard
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Signals, Computer interface
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Shutting, fan noise, Turning on the laptop
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Room noise, write, read, Hard disk
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Turn on, turn off the old computer
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Computer mouse movement
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Closes the CD / DVD tray, Opens
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Laser printer
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Floppy disk reading
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Turn off the hard drive, Turn on
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Matrix printer
★★★★★