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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.
You are not decreasing r by 5 but 4 that's the part I am having diffuculty to understand.
The test code doesnt check for whole rows and columns. It only checks 3x3 squares.
Well done!
Yeah, that's not kata's fault, 5000+ completions in java BTW. Your code is going out of bounds on some array somewhere. Print the input, try to debug it. This link may be useful.
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