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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's not enough. There is more conditions than just "none of them are in the same row/column".
No, it's not. Why do you think it would be true?
Not a kata suggestion!