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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 agree with @CodeMan99 here that it would be better if either the description explained that numbers can not be greater than 99, and must be zero padded, or one of the examples could "hint" to this fact.