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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.
Trivial map/filter/reduce is not a novel kata idea.
The formula in the description is very hard to see using dark mode.
No random tests, someone please add them for this kata to get approved