How to use previous iteration's output in the prompt?

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1. Is this request related to a challenge you're experiencing? Tell me about your story.

I was trying to extract characters in a novel. I used an iterator with a llm in it to handle each chapter step by step, but I wanted to use the output of the previous iteration in the prompt of the next iteration, since it should know who has appeared in previous chapters.
How can I do it?

2. Additional context or comments

No response