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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.
Good solution. Even more you could have saved some cpu time had you used TreeSet instead of HashSet. In this case you don't need the line -> Arrays.sort(resultArray). And yes I'm aware that TreeSet takes more time than HashSet but still thats better for this case.