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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.
这个题设计的很巧妙，cool
这个题很难，不过对于提升逻辑的判断很有帮助