Hi Michael, I have a few questions regarding the assignment that I would like to clarify and confirm. 1) Is it safe to assume that all tested queries will always use either a .csv file of the same format(columns) or a file name that doesn't exist? Should any antibugging be done to check the validity of the file beyond the file existing and having more than one line? 2) Is it okay to have ONE general error state for the second input argument, instead of divided into two cases of Year and Country? 3) This was kinda mentioned in the assignment rubric, but I wanted to confirm, is it okay if I use only echo for all the output involved in the assignment (errors and results)? Thank you so much!