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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'd recommend adding 1 or 2 sample tests with numbers/special characters in it ensure people are coding with them in mind. It was a surprise when I saw them on the full set of tests.