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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.
2511 persons have already solved it in Python (2512 with me now), the random tests couldn't be broken as you say nor I had problems with it.