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As a note that I forgot to mention in the video, there are no guarantees in this program regarding which solution will be found if there are multiple solutions of equal length. This is because each depth layer in the search is represented by an unordered set in python. So although it does produce the same solution every time that I've run it in my particular environment, there are no guarantees that this will be the same solution across multiple versions and implementations of the python standard library.