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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.
WTF,if the topic is retired,Why not Keep some test environment on Github or other websites?
after all,This is bad,only have one solution but don't have test cases.