Hi Professor, I have some questions regarding the assignment: 1. For the requirement to report any lines that do not have the same number of cells (with cells allowed to be empty), your previous answer mentioned printing an error message to stderr. Do we also need to identify the line number and specify which file it belongs to? 2. Regarding the output for script 1, am I allowed to sort the data? I noticed that in sample2, the data is not sorted alphabetically by country. I assume that if I use a join operation, the file needs to be sorted first. Can we sort the data based on the country? 3. Also, how should we determine whether the output from script 1 is successful? Is it based on the total number of cleaned data records or some other criteria? Thank you for your guidance.