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    Thank you! If you liked this there are some similar kata which I used as reference that you may enjoy:

    Guess the array

    Digits

    Guess the (prime) number, digit by digit

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    Hey, I'm glad you liked it, and congrats on solving it.

    Katas have been getting way harder with time; a 6kyu nowadays is often equivallent to a few of the first 5kyu, even some 4kyu if you look hard enough. 

    But the kata is really simple once you understand it, not that that's super easy, but the final solution is simple, thus, most rating it 6kyu.