Computer keyboard:
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Turn on, turn off the hard drive
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Turn on, turn off the old monitor
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Closing the laptop cover, Opening
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Manual copy machine
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Laser printer
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Floppy disk reading
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Shutting, fan noise, Turning on the laptop
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Room noise, Hard disk, read, write
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Computer interface, alarm
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Repeatedly pressing a computer mouse
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Computer mouse click
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Double click computer mouse
★★★★★