By introducing the original permutation and the region, the conception of single permutation is proposed.
By introducing the original permutation and the region, the conception of single permutation is proposed.
在引入原排列和区的概念的基础上，提出了单排列的概念。
By introducing the original permutation and the region, the conception of single permutation is proposed.
在引入原排列和区的概念的基础上，提出了单排列的概念。