该算法每步运算可生成一列元素而不是一个元素，因而减少了运算次数，加快了生成速度。
Its each operational step produces a string of elements instead of one element. Hence the algorithm reduces the time of operation, and accelerates the speed of generation.
该算法每步运算可生成一列元素而不是一个元素，因而减少了运算次数，加快了生成速度。
Its each operational step produces a string of elements instead of one element. Hence the algorithm reduces the time of operation, and accelerates the speed of generation.
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