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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.
On, or after ?
Oh well, you'll have to do your own debugging anyway, bit hard to do from a distance .. good luck!
Clojure? ( Mention that next time! )
You're probably close. You might be in an infinite loop; there's a test at the end that sometimes throws people for a loop. Print inputs and intermediates!