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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.
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I don't know Clojure at all, but can't you do some kind of type-check where you assess the input before trying to process it?
Doing the challenger in Clojure. I can pass all the tests except sort-odd-random-test. This one throws a java.lang.IllegalArgumentException: Argument must be an integer: error.
Not sure what I am missing.