Finished files are the result of years of scientific study combined with the experience of years.
How many F's are in the previous sentence?
One of average intelligence finds three of them. If you spotted four, you're above average. If you got five, you can turn your nose at most anybody. If you caught six, you are a genius. There is no catch. Many people forget the "of"s. The human brain tends to see them as V's and not F's.