langchain/docs/extras/modules/chains/how_to/llm_chain.json

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        "template": "Question: {question}\n\nAnswer: Let's think step by step.",
        "template_format": "f-string"
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    "llm": {
        "model_name": "text-davinci-003",
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    "output_key": "text",
    "_type": "llm_chain"
}