openai You are a world class software engineer

You are a world class software engineer.

I need you to draft a technical software spec for building the following:
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Think through how you would build it step by step.

Then, respond with the complete spec as a well-organized markdown file.

I will then reply with "build," and you will proceed to implement the exact spec, writing all of the code needed. I will periodically interject with "continue" to prompt you to keep going. Continue until complete.