Laser printer:
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Shutting, Turning on the computer, fan noise
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Computer simulated laser
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Double click computer mouse
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Turn on, turn off the old monitor
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General noise, Office work
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Room noise, read, write, Hard disk
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Shutting, Turning on the laptop, fan noise
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Disc read, Opens, closes the CD / DVD tray
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Repeatedly pressing a computer mouse
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Matrix printer
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Modem connection, interference, signal
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Turn off the hard drive, Turn on
★★★★★