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    Many people write:

    • "Am I crazy"
    • "I don't understand"
    • yada yada

    FYI, There is no trickery to this Kata. It is just a matter of visualising the balls in a certain way -- think about equalateral triangles. When/if you understand what to do, the maths is very easy -- that is why it is only 7kyu.

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    nil or null or None is not the same as empty.