Feedback for “Retrieval Augmented Generation (RAG)”

> **Copied from upstream:** [dair-ai/Prompt-Engineering-Guide#237](https://github.com/dair-ai/Prompt-Engineering-Guide/issues/237)
> **Original author:** @moabdelmoez
> **Originally created:** 2023-07-26

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The LangChain link in "Retrieval Augmented Generation (RAG)" is not working