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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.
Can this solution be too memory intensive when calculating big intervals?
Why that? The kata was modified in this way by @kazk who is the CW maintener.
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Why should the clojure version return nil? I would have thought an empty collection was a much better representation of an empty path than nil is.