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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.
In sudoku also 3x3 grid can not have the same numbers
The whole thing is a 9x9 grid, which is made of 9 3x3 grids, in which all 9 numbers also have to be different
No, this aged like vine, it just got funnier