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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 whatever split maximizes the value of the 5th runner, provided that the 5th isn't greater than any of the proceeding (and to the extent it's possible). In your example 10 > 2, hence selected.
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