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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.
This soulution contains an error in the case that if the word contains only uppercase and lowercase letters ,then ok equals 2 and it is not smaller than 2 , then valid is returned