Turning on the laptop, fan noise, shutting down:
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Computer mouse movement
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Computer keyboard
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Manual copy machine
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Computer noise, Communication room
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Typewriter, environmental sounds, Office work
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Computer mouse click
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Hard disk, write, read, room noise
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Computer simulated laser
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Photocopy (photocopy)
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Floppy disk reading
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Old computer keyboard
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Modem connection, interference, signal
★★★★★