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In the notebook question_answering.ipynb
([link](https://github.com/hwchase17/langchain/blob/master/docs/modules/chains/index_examples/question_answering.ipynb)),
and the notebook qa_with_sources.ipynb
([link](https://github.com/hwchase17/langchain/blob/master/docs/modules/chains/index_examples/qa_with_sources.ipynb)),
the first paragraph contains a dead link:
> This notebook walks through how to use LangChain for question
answering over a list of documents. It covers four different types of
chains: stuff, map_reduce, refine, map_rerank. For a more in depth
explanation of what these chain types are, see
[here](
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.. | ||
examples | ||
generic | ||
index_examples | ||
getting_started.ipynb | ||
how_to_guides.rst |