The specification states: "Add a month column (containing numbers 1..12) and a year field (containing 4-digit years), in that order, after the final column (currently Type_of_Breach)" According to the clean data file the "Location_of_Breached_Information" and "Summary" columns are removed and replaced with the "Month" and "Year" column. Now, this begs the question - can we assume that all dirty files will have the same original columns and just replace the last two, or do we need to iterate to Type_of_Breach and then remove any column afterwards (IF there are any) and then apppend the Month and Year. I know this seems nitpicky but these two different scenarios could either cause errors or over-complexity for the task if my intuition differs from the test case, thus losing marks.