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Opening, closing the laptop cover
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Input error sound, Pressing a keypad
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Room noise, write, read, Hard disk
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Computer keyboard
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Computer simulated laser
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Computer interface, alarm
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Old computer keyboard
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Photocopy (photocopy)
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Floppy disk reading
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Repeatedly pressing a computer mouse
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Turning on the laptop, fan noise, shutting
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Communication room, computer noise
★★★★★