Opening, closing the laptop cover:
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Turn on, turn off the old monitor
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Computer keyboard
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Jet printer
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Sound signal of a bios computer, bios
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Pressing a keypad, input error sound
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Matrix printer
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Double click computer mouse
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Laser printer
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Manual copy machine
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Interference, signal, Modem connection
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Fan noise, Turning on the computer, shutting
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Fan noise, Turning on the laptop, shutting
★★★★★