> For the complete documentation index, see [llms.txt](https://trizen.gitbook.io/sidef-lang/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://trizen.gitbook.io/sidef-lang/programming_tasks/9.md).

# 9

- [99 bottles of beer](https://trizen.gitbook.io/sidef-lang/programming_tasks/9/99_bottles_of_beer.md)
- [9 billion names of God the integer](https://trizen.gitbook.io/sidef-lang/programming_tasks/9/9_billion_names_of_god_the_integer.md)