人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用
type DropLast[T] = typing.Slice[T, Literal[0], Literal[-1]]
，这一点在Line官方版本下载中也有详细论述
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Then we would probably also want to allow specifying a Member (but
[5] L. Liang & D. Hale: “A stable and fast implementation of natural neighbour