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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.
Same thing happened to me! Another test case given was [1, None, 2, 1, 0, 0, 0] should equal [1, None, 2, False, 1, 0, 0]. Where did that False came from? Moving on to other katas for now I guess