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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.
Are you by any chance printing instead of returning the result?
That's because your foreign environment doesn't have all the correct tests. it's best to remain on CW for that reason.
My solution works as expected on my machine but it's a different case on here.