> 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/2017/01/04.md).

# 04

![](https://385430918-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M8iFCzaIpXf8zXqpE6I%2F-MHQPJrcr5xqmfUZGSSb%2F-MHQPkx3MhfW82_67RZW%2Fimage.png?alt=media\&token=b184b554-a638-4aa2-9aad-24b1d9144d82)