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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Not a kata issue, please read this: https://docs.codewars.com/training/troubleshooting
You're returning a vector with a single string, with double quotes and commas, and you should return a vector of strings, where each string has a length of 2.
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Please use markdown tags to format your code or it is very discomfortable to read: how-to-format-code-in-markdown.
Why are you using the function declaration to declare vars? Why don't you do it inside the function's body?
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