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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.
Missing specifies that it can be a rectangular matrix, and that despite the fact that there is a center, I know that it is obvious since the center exists, but it is worth clarifying. (i,j are odd)