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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.
I think it's bad practice to use a ArrayList with int. Since each time the ArrayList is accessed, the packaging is unpacked by a variable to the object type.