Turning on the computer, fan noise, shutting down:
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The USB flash drive is inserted, removed
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Fan noise, Turning on the laptop, shutting
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Old computer keyboard
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Manual copy machine
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Repeatedly pressing a computer mouse
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Computer simulated laser
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Shutting, fan noise, Turning on the computer
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Jet printer
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Computer interface, alarm
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Computer interface, signals
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Laser printer
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Signal read information, Computer interface
★★★★★