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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.
The board is always 9 cells by 9 cells, and every cell only contains integers from 0 to 9.So, this is not within the scope of katakata hint != kata suggestion
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Does that seem valid to you? Check the link with the rules of Sudoku.
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