> 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/2019/01/04.md).

# 04

![](https://385430918-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M8iFCzaIpXf8zXqpE6I%2F-MTTyQISgln9e4te2Lc9%2F-MTTygQT-bjmRQgh_f4p%2Fimage.png?alt=media\&token=3a017a80-9031-4825-9d3b-8316fd2a3c1c)