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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.
Unfortunately cant change rank
done
The example is enough to identify what to implement, and there's really no special cases (if you understand the requirements correctly).
If you ask for help don't post an issue but a question. The fixed tests are the same in all languages and 391 guys passed the kata.