# Page Not Found

The URL `mod-4-async` does not exist.

You might be looking for one of these pages:
- [Data Structures & Algorithms](https://marcylabschool.gitbook.io/marcy-lab-school-docs/mod-x-ds-a.md)
- [Capstone](https://marcylabschool.gitbook.io/marcy-lab-school-docs/mod-10-capstone.md)
- [Mod 2 - Object-Oriented Programming](https://marcylabschool.gitbook.io/marcy-lab-school-docs/mod-2-oop.md)
- [Mod 7 - React](https://marcylabschool.gitbook.io/marcy-lab-school-docs/mod-7-react.md)
- [Mod 3 - HTML & CSS](https://marcylabschool.gitbook.io/marcy-lab-school-docs/mod-3-html-css.md)

## How to find the correct page

1. **Browse the full index**: [/sitemap.md](https://marcylabschool.gitbook.io/marcy-lab-school-docs/sitemap.md) - Complete documentation index
2. **View the full content**: [/llms-full.txt](https://marcylabschool.gitbook.io/marcy-lab-school-docs/llms-full.txt) - Full content export

## Tips for requesting documentation

- For markdown responses, append `.md` to URLs (e.g., `/marcy-lab-school-docs/mod-x-ds-a.md`)
- Use `Accept: text/markdown` header for content negotiation