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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.
Why is this question tagged as graph?
If there is a graph approached solution could you please share?
Come on guys, this is inefficient as hell.