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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.
There is a problem with tests, as they don't include all correct results in the resulting list. I get more values and those additional ones also correct, so there is something wrong with tests and answers. Please fix