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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.
would have been more elegant to just use reverse string slicing.
What is better: to iterate over integers up to square root, or over integers whose square is not bigger than n?