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    hello
    helol
    heoll
    hlelo
    hleol
    hlleo
    hlloe
    hlole
    hloel
    holle
    holel
    hoell
    elloh
    ...
    

    Are you sure "hello" has only 12 anagrams?
    Also: I'm not sure because the site doesn't show it clearly, but it seems there are several katas which have the same leitmotif as this kata (or can be reduced to such).

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    "unique_anagrams("aaa") # Output: 0"

    That should be 1, right?

    Your description markup is off, making the examples unreadable.

    And again, this is a duplicate and you should unpublish it. Please do better research before creating new kata. In Discord#kata-ideas you can call on the collective memory of quite a few people who collcetively have seen almost all kata.