# Page Not Found

The URL `language-core/performances` does not exist.

You might be looking for one of these pages:
- [5 - Custom structures](https://syl1.gitbook.io/julia-language-a-concise-tutorial/language-core/custom-types.md)
- [4 - Functions](https://syl1.gitbook.io/julia-language-a-concise-tutorial/language-core/functions.md)
- [9 - Metaprogramming](https://syl1.gitbook.io/julia-language-a-concise-tutorial/language-core/metaprogramming.md)
- [2 - Data types](https://syl1.gitbook.io/julia-language-a-concise-tutorial/language-core/data-types.md)
- [1 - Getting started](https://syl1.gitbook.io/julia-language-a-concise-tutorial/language-core/getting-started.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://syl1.gitbook.io/julia-language-a-concise-tutorial/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://syl1.gitbook.io/julia-language-a-concise-tutorial/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/julia-language-a-concise-tutorial/language-core/custom-types.md`)
- Use `Accept: text/markdown` header for content negotiation