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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.
Should be mentioned in the description that queens are not attacking other queens and can be places anywhere relative to each other.
The description says that n is the size of the board, but this should be corrected to say that the board is n x n squares.