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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.
I have the same issue and did not understand that unlimited edition means that the size of the board should change. So - what does this mean, exactly? That if a row or a column is all 0's we delete the row or column? Then how do we end up with the same size grid as when we started?