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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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Resolving question.
I'll give you a full example:
You can't use any number, the number you have to return is the position that particular word is when sorted alphabetically between all the words with the same letters, is it clearer now? Mark it as resolved if it is.
"We can then assign a number to every word, based on where it falls in an alphabetically sorted list of all words made up of the same group of letters."