> For the complete documentation index, see [llms.txt](https://www.oulan.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.oulan.com/2017/03/27.md).

# 27

![](https://385430918-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M8iFCzaIpXf8zXqpE6I%2F-MTY0xVFCAZA2B4W6koN%2F-MTY1k2fpoza3Db5ahVi%2Fimage.png?alt=media\&token=4f3c1d6c-47c6-4934-b127-2be24188d585)