Turn on, turn off the hard drive:
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Closing the laptop cover, Opening
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Computer interface, signal read information
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Modem connection, signal, interference
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Manual copy machine
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Old computer keyboard
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Photocopy (photocopy)
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Computer interface, signals
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Turn off the old monitor, Turn on
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Computer mouse movement
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Franking machine
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Repeatedly pressing a computer mouse
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Computer interface, alarm
★★★★★