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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.
Letters should only go from A to F. This goes both to upper and lower case.
It seems you are calling every possibe letter in the alphabet.