Opening, closing the laptop cover:
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Computer noise, Communication room
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Write, read, Hard disk, room noise
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Photocopy (photocopy)
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Closes the CD / DVD tray, Opens
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Closes the CD / DVD tray, disc read, Opens
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Laser printer
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Turn on, turn off the old monitor
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Repeatedly pressing a computer mouse
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Matrix printer
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Fan noise, Turning on the computer, shutting
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Sound signal of a bios computer, bios
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Computer mouse movement
★★★★★