Loading collection data...
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'm not sure that this should be best practice, because it's need to iterate array two times.
536870912 = 229
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Why so difficult?
What is an invalid input here?