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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.
It's not available in the Node version (v8.1) used by the kata, so you won't be able to use it.
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Are there some errors in the final test? I have passed all tests but I cannot pass the same sample in the final test.