Opening, closing the laptop cover:
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Computer interface, signals
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Laser printer
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Manual copy machine
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Computer simulated laser
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Communication room, computer noise
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Old computer keyboard
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Repeatedly pressing a computer mouse
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Office work, environmental sounds, typewriter
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Photocopy (photocopy)
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Turning on the computer, shutting, fan noise
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Modem connection, interference, signal
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The USB flash drive is inserted, removed
★★★★★