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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.
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No, I havn't received any call stack limit errors with this recursive solution.
imsorry
Considering it's functionally the same as your solution, I agree xD
Semicolon in the end of string and let declaration are unnecessary. It can be shorter.