Opens, closes the CD / DVD tray, disc read:
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Pressing a keypad, input error sound
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Removed, The USB flash drive is inserted
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Hard disk, write, room noise, read
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Office work, general noise
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Environmental sounds, typewriter, Office work
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Manual copy machine
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Repeatedly pressing a computer mouse
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Laser printer
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Photocopy (photocopy)
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Computer interface, alarm
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Double click computer mouse
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Turn on, turn off the hard drive
★★★★★
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