1step,rule,n_before,n_after,n_removed,rationale21,drop exact duplicate rows (all columns identical),445,400,45,file assembled from several extracts; one intended row per firm32,convert revenue to millions USD (USD_thousands / 1000),400,400,0,"mixed currency units across rows; recoding only, no rows removed"43,exclude firms with empty revenue from revenue aggregates,400,394,6,revenue unknown; firms: F0048 F0121 F0129 F0269 F0348 F03995