# Page Not Found

The URL `files/8hkin9lXD8adND4gmvnl` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [弱区域和删数的秩](https://sudoku.kazusa.tech/rank-theory/08-rank-of-link-and-elimination.md)
- [唯一余数](https://sudoku.kazusa.tech/direct-technique/02-naked-single.md)
- [同数链和异数链](https://sudoku.kazusa.tech/chain-theory/02-x-chain-and-multidigit-chain.md)
- [拓展矩形（XR）](https://sudoku.kazusa.tech/full-marking-techniques/07-extended-rectangle.md)
- [条件致命结构](https://sudoku.kazusa.tech/deadly-pattern-theory/11-conditional-deadly-pattern.md)

## How to find the correct page

If the exact page cannot be found, you can still retrieve the information using the documentation query interface.

### Option 1 — Ask a question (recommended)

Perform an HTTP GET request on the documentation index with the `ask` parameter:

```
GET https://sudoku.kazusa.tech/rank-theory/08-rank-of-link-and-elimination.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

### Option 2 — Browse the documentation index

Full index: https://sudoku.kazusa.tech/sitemap.md

Use this to discover valid page paths or navigate the documentation structure.

### Option 3 — Retrieve the full documentation corpus

Full export: https://sudoku.kazusa.tech/llms-full.txt

Use this to access all content at once and perform your own parsing or retrieval. It will be more expensive.

## Tips for requesting documentation

Prefer `.md` URLs for structured content, append `.md` to URLs (e.g., `/rank-theory/08-rank-of-link-and-elimination.md`).

You may also use `Accept: text/markdown` header for content negotiation.