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Standardise case, spaces and synonyms; check ordinal order. Concepts: Label cleanup; ordinal categories Project A: Ordinal columns: checking_account, savings_bonds, employment_since, credit_history (risk order). Set explicit category order; keep 'unknown' outside the ordinal scale. Project B: weather_description has many near-duplicate labels ('light rain', 'light intensity shower rain') → group into a few weather types.
Builds on: B14 · Build: Data Cleaning Clinic (messy customer data)