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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 had the same solution, except I don't use the
contains()method but directly theadd()method in the if, which also tells me that the element was already in the set if it returns false.