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    I had a similar moment @crosssh, the test cases are a little ambiguous, if you comment out the first test case and remove your join you will see what is going on.

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    Your code is wrong, the easy way to check that is seeing how many completions there already are.

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

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    There is no issue with the kata, you get that error with the second test, not the first one. Check it on repl.it

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