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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.
Duplicate.
Fixed. Thanks for reporting.
Since it appears the creator of this kata has disappeared, I have added a couple more fixed cases, example cases, and also random tests as well. I have also changed the description to be more clear. Please mark this as resolved if it is fine, otherwise let me know what else I should do. Thanks.