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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.
This is also an important lesson, do not underestimate it.
Also not many languages have a built-in function which realises the task here. You can try it in Pyton or JS,then you will have to Google for something else than built-in.