> 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/2020/02/01.md).

# 01

向左向右，向前向后。

![](https://385430918-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-M8iFCzaIpXf8zXqpE6I%2F-MSk6WmBh0X1oKMhxzkJ%2F-MSk8bjVxc673mEkJ-WF%2Fimage.png?alt=media\&token=55c4e7f5-f12b-46be-8923-0571901d2ec1)