> I'd appreciate any advice on my solution. You should always compare your results to what is expected. For a problem like this, use a small set of test data t

> I'd appreciate any advice on my solution. You should always compare your results to what is expected. For a problem like this, use a small set of test data that can easily be counted and sorted in your head or on paper. You forgot reverse=True and your results show the 10 least common words. ;) This kind of error happens to all of us. That's why we have unit tests and QA teams. If you made this mistake during an interview I wouldn't give it much importance and we would have a good laugh about it.