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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.
Very frustrating if you get timeouts, although the identical solution has worked for others!! (python)
Use as a parameter for center not 0, but the length of the string you need inlcuding whitespaces