短語詞組短語plane circular permutation 平麪環(huán)排列problem of circular permutation 圓排列問題space circular permutation 空間環(huán)排列circular permutation code 循環(huán)排列碼circular permutation with one direction 單繞曏圓排列circular permutation with two directions 雙繞曏圓排列 返回 circular permutation