As the article states in the introductory paragraph, this problem encompasses more than just counting strings. It also involves "some fundamental tasks of natur

As the article states in the introductory paragraph, this problem encompasses more than just counting strings. It also involves "some fundamental tasks of natural language processing (NLP): tokenization (dividing a text into words), stemming, and part-of-speech tagging for lemmatization", so a little more work is required here.