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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.
A Jagged array works for the kata without any issues.
Yes, it helps the user visual the directions. Using the down and right arrows as if playing with a controller.