给出了多人对策的局中人集的排列置换数目的计算公式及递推公式。
The recurrence formula of the permutation Numbers of the players of then person game is also deduced.
我必须集中精力注意这里的排列置换：流动的图像不停的在我脑海中漩转，如万花筒中的碎片一般分离又重整。
I have to work hard to concentrate on my Permutations here: a flow of images swirls unceasingly in my mind, breaking up and reforming as though in a kaleidoscope.
Acrobot是通过帮助外科医生在现存膝盖骨的基础上排列需置换的部分而起作用。
Acrobot works by helping the surgeon to line up the replacement knee parts with the existing bones.
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