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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.
I admire you case you can complete with such a long arrgy!
索引是从0开始的，索引6左边的所有数的和为0