Opens, closes the CD / DVD tray, disc read:
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Double click computer mouse
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Turn on, turn off the old computer
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Laser printer
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Computer mouse movement
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Computer keyboard
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Disc read, CD / DVD drive
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Pressing a keypad, input error sound
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Repeatedly pressing a computer mouse
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Matrix printer
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Manual copy machine
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Jet printer
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Room noise, Hard disk, read, write
★★★★★