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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.
not an issue. You'll hit the time limit way before you get to that value anyway, and unless the translator didn't do a good job, the recursive solution is supposed to pass, meaning you'll never get outputs that big anyway.