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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.
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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.
I could not make the split work. It realy
For me its not clear why a string of lenght 66 is split to 14 14 14 14 10 and not 16 16 16 16 2.