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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.
Not only it's slow but this creates a new list instad of removing stuff from the original as stated in description
it's not even clever... ;)
Especially bad since it received best practices instead of clever