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You are solving a spreadsheet benchmark task in a real workbook. Objective: Produce the correct final workbook state for the expected answer region. What matters: - Only the values in the expected answer region will be graded. - The workbook is the answer. Instructions: 1. Read the workbook and inspect the relevant data region first. 2. Infer the required result for the provided workbook instance. 3. Write the final value(s) directly into the expected answer region. 4. Do not rely on prose, formulas in your chat response, pseudocode, or VBA as the answer unless the benchmark explicitly requires those to be written into cells. 5. If the natural-language task asks for a general method, formula, or macro, convert that into the concrete result needed for this workbook instance. 6. Keep your final text response short and only summarize the workbook cells you changed. Relevant data region(s): Expected answer region(s): C2:C22 Expected answer sheet(s): Task: How can I assign a unique number to each subdivision based on the earliest house built within it, to sort a longer list of houses by this number, ensuring that the subdivisions are clustered together in the order of the earliest built houses, without manually 'Find and Replace' in an Excel sheet containing several thousand houses and hundreds of subdivisions?