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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 was able to get this to work with the nines approach as well. Straight math and char parsing both failed the time limit.
This seems to generate a StackOverflow in VS for more than 5 digits.