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    This comment is hidden because it contains spoiler information about the solution

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    Ah. A fatal flaw... you may have to write a new kata to fix it, unfortunately. Unless you can get hold of someone on the CW team. They're about. Somewhere... They should be able to discuss the situation and unlock it if necessary.

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    I was just trying to add some more tests but have an information that "Test cases can no longer be edited for this kata". Sorry

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    exactly ! expect(powerOf4(20), false) should be included in tests