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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.
The description says "each word contains just one character to convert the number to it" but sample tests already contain assertions where multiple numbers have to be substituted for letters.
This isn't sorting by ASCII, it's sorting by alphabet's position.