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Example notebook of OpenAI got ConstraintException

3

**The bug** When using latest version of guidance '0.1.15' and run [notebook](https://github.com/guidance-ai/guidance/blob/c9e71fbc3a434eab5209c31735d72fd7e60876f2/notebooks/api_examples/models/OpenAI.ipynb) multiple times ( < 10), it failed with error: ``` ConstraintException: The model attempted to generate b'THE CAPITAL...