Hard disk, read, write, room noise:
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Computer interface, alarm
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Double click computer mouse
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Computer keyboard
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Laser printer
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Opening, closing the laptop cover
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Floppy disk reading
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Computer interface, signal read information
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Turn off the old monitor, Turn on
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Franking machine
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Turn off the old computer, Turn on
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Computer simulated laser
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Write, read, Hard disk, room noise
★★★★★