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Speaking of list of list on wikipedia, there is also this: https://en.wikipedia.org/wiki/List_of_lists_of_lists, to which I just added your "lists of unsolved problems".

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http://www.raikoth.net/lololol.html

List of lists of lists of lists

That URL reminded me of this [1].

[1] - https://www.youtube.com/watch?v=TJL4Y3aGPuA

and i thought that this wiki article was created automatically by a wikipedia bot - in this case it would have been more complete (interesting why they don't use a bot to create the list of lists of lists)

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