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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 a fun kata. Once you find out how to arrange the board its quite easy. Rearranging an array is not so uncommon I would say - taking into account my limited knowledge of coding though.