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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.
Hello, I made a Python translation, review it and approve it if it's good
For the Java translation, I'd suggest making the method signature static. As there is no reason to create an instance.
Trivial map/filter/reduce is not a novel kata idea.