# Page Not Found

The URL `files/ymWzKuF1dPBUsRTNYoUl` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [伪数组（ESP）](https://sudoku.kazusa.tech/full-marking-techniques/12-extended-subset-principle.md)
- [毛刺数组链](https://sudoku.kazusa.tech/chain-theory/06-burred-subset-chain.md)
- [作者介绍](https://sudoku.kazusa.tech/miscellaneous/about-author.md)
- [待定可规避矩形链（AAR 链）](https://sudoku.kazusa.tech/chain-theory/08-almost-avoidable-rectangle-chain.md)
- [Ⅴ：HoDoKu 技巧编号一览表](https://sudoku.kazusa.tech/appendix/01-hodoku-library-technique-codes.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/full-marking-techniques/12-extended-subset-principle.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., `/full-marking-techniques/12-extended-subset-principle.md`).

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