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19## 🤔 What is this?
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21▶Legacy chains, `langchain-community` re-exports, indexing API, deprecated functionality, and more.
22
23In most cases, you should be using the main [`langchain`](https://pypi.org/project/langchain/) package.
· · ·
23▶In most cases, you should be using the main [`langchain`](https://pypi.org/project/langchain/) package.
24
25## 📖 Documentation
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