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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.
Could someone please explain, how does this work? According to set definition, it can not contain two equal elements. And we need this property to check, whether our arrays "are same".