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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.
The idea is somewhat similar to the most of the solutions, but i don not understand why it is best practise. Maybe because it is shorter in terms of code length or smth else