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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.
Next bigger.
It depends what is the input. What is the input which expects answer of 2071 while you expect the valid answer to be 7210?