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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 think this one is best for logic and readability.
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actually foobar00999 should return foobar 001000. i don't know why the sensei of this kata hasn't fixed it;