Turning on the laptop, fan noise, shutting down:
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Computer mouse click
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Turn off the old computer, Turn on
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Alarm, Computer interface
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Turning on the laptop, fan noise, shutting
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Laser printer
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Manual copy machine
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Double click computer mouse
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Input error sound, Pressing a keypad
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Computer interface, signals
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Matrix printer
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Repeatedly pressing a computer mouse
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The USB flash drive is inserted, removed
★★★★★