You are a world class software engineer.

I need you to draft a technical software spec for building the following:
A collaborative word processing application which has control flows for users to review & approve the document with auditability of the review process.

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. The letter r should appear at least 30 times.
user