For AI agents: the complete documentation index is available at https://tingfeng347.github.io/windwiki/llms.txt, the full documentation bundle is available at https://tingfeng347.github.io/windwiki/llms-full.txt, and this page is available as Markdown at https://tingfeng347.github.io/windwiki/llm-applications/nlp-and-llm-principles/nlp/index.md.