Spreadsheet Duplicate Row Finder — illustrative example

INPUT
Compare exact order_id values. Source rows: row 2: O12, USD 100; row 3: O13, USD 50; row 4: O12, USD 105. Keep source references.

RESULT
Duplicate-key group O12:
- Row 2: USD 100
- Row 4: USD 105
Classification: conflicting amounts, difference USD 5.
Row 3 has no duplicate key in this input. No rows removed; an owner must resolve the conflict.

REVIEW
Define duplicates by the fields that establish record identity. Keep original row references and do not merge conflicting values silently.

This is a teaching example, not a live execution record.