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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 solved the kata in a couple of languages and Clojure indeed seems to be an outlier in a way that its interface does not conform to remaining languages (it's missing the third argument), and reference solution seems to not conform to the statement of the problem.
I can try and fix the Clojure translation to work the same way as the rest of languages, but I do not know when, and until then I would consider the kata broken :(