Each such arrangement is a permutation of the symbols .
每一个这样的摆布都是这些符号的一种排列。
Whatever their meaning and wherever they may be headed , the hippies have emerged on the u.s. scene in about 18 months as a wholly new subculture , a bizarre permutation of the middle-class american ethos from which it evolved .
According to london shoe specialist john rushton , there is , however , one item that has no acceptable permutation for politicians on holiday : flip-flops .