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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 completed this kata with Java and I had no problems. I found it good for training sorting collections. The only thing I would add to the description is that the original input String comes with ',' between fields and you're expected to remove the commas for the output.