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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.
i think it'll take too much time with bigger strings, bc in the worst case if all letters are in the end of alphabet every letter will be found after full alphabet check((
but i'm not actually sure if it's faster than getting index by alphabet.index(letter)