> 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/2016/11/30.md).

# 30

![](https://385430918-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M8iFCzaIpXf8zXqpE6I%2F-MGliNUEs_RCmruvwg2R%2F-MGliV-DtXBLaMFW13jE%2Fimage.png?alt=media\&token=8dc6848b-a4f5-4718-ad8e-4a022308cdec)