per·mu·ta·tion
noun/ˌpɜːmjuˈteɪʃn/
/ˌpɜːrmjuˈteɪʃn/
[usually plural]- any of the different ways in which a set of things can be ordered
排列（方式）；组合（方式）；置换 - The possible permutations of x, y and z are xyz, xzy, yxz, yzx, zxy and zyx.
x、y 和 z 的可能的组合方式为 xyz、xzy、yxz、yzx、zxy 和 zyx。
Word Originlate Middle English (in the sense ‘exchange, barter’): via Old French from Latin permutatio(n-), from the verb permutare ‘change completely’, from per- ‘through, completely’ + mutare ‘to change’. - The possible permutations of x, y and z are xyz, xzy, yxz, yzx, zxy and zyx.