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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 feel like it should be mentioned in the problem Statement that not only you have to check if the numbers lign up, but also if the string is the exact lenght, contains ivalid characters etc.