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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.
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how does
letterknow what to compare the given array with? and how does it know the alphabet order here? and why doesn't it need to be converted to lower/upper case?