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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.
Fixed.
For the random tests in python, the wording in the message you get when it is incorrect is switched (ex: when it is supposed to say None should equal ['four'], it says ['four'] should equal None)