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In this video tutorial, the focus is on extracting characters from the end of a string using a pizza patent dataset from espacenet. Each publication number contains a kind code in brackets, indicating the type of patent document. For example, a kind code of 'u' indicates a utility model in Korea, while 'a1' signifies the first publication of a patent application. Similar classifications exist in other countries like the US. The video also highlights the importance of understanding these codes to differentiate between patent applications and grants, and begins to discuss methods for extracting this useful information from the dataset.