Design error in a millisecond years, free proof of the digital clock, minutes and seconds required with a display, power-down when the clock is running, free proof.

设计一个年误差在毫秒级、免校对的数字钟，要求带有时分秒显示、掉电时时钟正常运行、免校对。

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In his lab Pister has scaled his network to some 800 motes sending error-free data every two seconds.

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