Pressing a keypad, input error sound:
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Turn off the old computer, Turn on
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Matrix printer
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Read, Hard disk, room noise, write
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Old computer keyboard
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Floppy disk reading
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Signal read information, Computer interface
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Repeatedly pressing a computer mouse
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Manual copy machine
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Sound signal of a bios computer, bios
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Office work, typewriter, environmental sounds
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Double click computer mouse
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Alarm, Computer interface
★★★★★