> 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/2020/04.md).

# 04

- [02](https://www.oulan.com/2020/04/02.md)
- [01](https://www.oulan.com/2020/04/01.md)