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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 only is if you are counting only rows and columns. However, sudoku also has squares(nine squares in total), and this test has valid rows and columns, but not valid squares.