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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.
7201 is the maximum number, but not next number for 2017.
2017 can makes { 0127, 0172, 0217, ..., 1720, 2017, 2107, ..., 7201 }, so next of 2017 is 2107