investigate llamaindex gramar/guidance

[Dodorotata]

• https://github.com/guidance-ai/guidance
• https://docs.llamaindex.ai/en/stable/examples/output_parsing/guidance_pydantic_program/?h=guidance
• Basic tutorial on guidance: https://github.com/guidance-ai/guidance/blob/main/notebooks/tutorials/intro_to_guidance.ipynb

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• https://fsndzomga.medium.com/i-tried-guidance-a-language-to-control-llms-and-i-am-impressed-cca3626a5dea