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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.
It's not necesary that the initial number be 0, at the very least in my test, if you enter a number like 98065, if produces an error
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This Kata is defective if the initial number has 0 in it. There should be a condition for it.