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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.
Warning with java: it tells you that your solution lacks the cage at the end (or something like that...) by putting it inside
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characters. It's a pin in the ass, considering the task to do here, but it works like that. So, no, there are no cages inside other cages. ;)