> For the complete documentation index, see [llms.txt](https://haoyi-han-1998.gitbook.io/koiniitarubyo/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://haoyi-han-1998.gitbook.io/koiniitarubyo/chapter4/4-6.md).

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