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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.
See the last 2 (and many more) posts on this page. This kata has a very strange definition of how an empty matrix should be represented.
IMHO the kata is broken.
"NOTE 2: The 0x0 (empty matrix) is represented as [[]]"
Yes, that doesn't make sense. At all. But that't the way the kata is written. :(