> 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/2016/12/04.md).

# 04

![](https://385430918-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M8iFCzaIpXf8zXqpE6I%2F-MGlmyDphZQFG7Pzu-1i%2F-MGlnHOQZEqZQo06YJG0%2Fimage.png?alt=media\&token=a38ebe85-023c-47ff-8468-c9a5308f98cb)