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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.
faster but, longer and not clear
Do you think that you have better solution?
But, we don't have resizable array, we know that sudoku has constant amount of cell - 9*9)
Can you explain why?