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1、Once there was a person who sold spears and sheilds. When someone came for the sheild, he would say, "This is the firmest sheild that can resist any attack from a spear. " But when someone came for the spear, he said the likewise words, " This is the sharpest spear that can pierce through any sheild." So another person asked:" What it would be if you pierce your sheild with your spear?" The paradox made him no answer.。
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